var-201511-0101
Vulnerability from variot
The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c. Linux Kernel is prone to a denial-of-service vulnerability. An attacker with a guest account can exploit this issue to cause an infinite loop in the host, denying service to legitimate users.
This update also fixes the following bugs:
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When doing TSO/GSO in the presence of VLAN headers on a macvtap device, the header offsets were incorrectly calculated. As a consequence, when 2 guests on the same host communicated over a guest configured VLAN, performance dropped to about 1 Mbps. A set of patches has been provided to fix this bug, and network performance with VLAN tags now works with optimal performance. (BZ#1215914)
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Prior to this update, TSO acceleration features have been removed from the VLAN device which caused that VLAN performance on top of a virtio device was much lower than that of a virtio device itself. This update re-enables TSO acceleration features, and performance of VLAN devices on top of a virtio device has thus been restored. (BZ#1240988)
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With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor Advertisement (UNA) was previously sent using the link global IPv6 address as source address. The underlying source code has been patched, and, after the failover in bonding, UNA is sent using both the corresponding link IPv6 address and global IPv6 address of bond0 and bond0.vlan. The problem could be seen for example with software mapping or re-mapping hugetlb areas with concurrent threads reading/writing to same areas causing page faults. (BZ#1274597)
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Previously, VLAN stacked on the macvlan or macvtap device did not work for devices that implement and use VLAN filters. As a consequence, macvtap passthrough mode failed to transfer VLAN packets over the be2net driver. This update implements VLAN ndo calls to the macvlan driver to pass appropriate VLAN tag IDs to lower devices. As a result, macvtap transfers VLAN packets over be2net successfully. Content-Disposition: inline
============================================================================ Ubuntu Security Notice USN-2842-2 December 17, 2015
linux-lts-vivid vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in the kernel.
Software Description: - linux-lts-vivid: Linux hardware enablement kernel from Vivid
Details:
Jan Beulich discovered that the KVM svm hypervisor implementation in the Linux kernel did not properly catch Debug exceptions on AMD processors. (CVE-2015-8104)
=E9=83=AD=E6=B0=B8=E5=88=9A discovered that the ppp implementation in the Linux kernel did not ensure that certain slot numbers are valid. (CVE-2015-7799)
It was discovered that the virtual video osd test driver in the Linux kernel did not properly initialize data structures. (CVE-2015-7884)
It was discovered that the driver for Digi Neo and ClassicBoard devices did not properly initialize data structures. (CVE-2015-7885)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 14.04 LTS: linux-image-3.19.0-41-generic 3.19.0-41.46~14.04.2 linux-image-3.19.0-41-generic-lpae 3.19.0-41.46~14.04.2 linux-image-3.19.0-41-lowlatency 3.19.0-41.46~14.04.2 linux-image-3.19.0-41-powerpc-e500mc 3.19.0-41.46~14.04.2 linux-image-3.19.0-41-powerpc-smp 3.19.0-41.46~14.04.2 linux-image-3.19.0-41-powerpc64-emb 3.19.0-41.46~14.04.2 linux-image-3.19.0-41-powerpc64-smp 3.19.0-41.46~14.04.2
After a standard system update you need to reboot your computer to make all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.
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A flaw was found in the way the Linux kernel's file system implementation handled rename operations in which the source was inside and the destination was outside of a bind mount. (CVE-2015-7613, Important)
-
It was found that the Linux kernel's keys subsystem did not correctly garbage collect uninstantiated keyrings.
This update also fixes the following bugs:
-
Previously, Human Interface Device (HID) ran a report on an unaligned buffer, which could cause a page fault interrupt and an oops when the end of the report was read. This update fixes this bug by padding the end of the report with extra bytes, so the reading of the report never crosses a page boundary. As a result, a page fault and subsequent oops no longer occur. (BZ#1268203)
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The NFS client was previously failing to detect a directory loop for some NFS server directory structures. This failure could cause NFS inodes to remain referenced after attempting to unmount the file system, leading to a kernel crash. Loop checks have been added to VFS, which effectively prevents this problem from occurring. (BZ#1272858)
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Due to a race whereby the nfs_wb_pages_cancel() and nfs_commit_release_pages() calls both removed a request from the nfs_inode struct type, the kernel panicked with negative nfs_inode.npages count. The provided upstream patch performs the required serialization by holding the inode i_lock over the check of PagePrivate and locking the request, thus preventing the race and kernel panic from occurring. (BZ#1273721)
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Due to incorrect URB_ISO_ASAP semantics, playing an audio file using a USB sound card could previously fail for some hardware configurations. (BZ#1273916)
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Inside hugetlb, region data structures were protected by a combination of a memory map semaphore and a single hugetlb instance mutex. However, a page-fault scalability improvement backported to the kernel on previous releases removed the single hugetlb instance mutex and introduced a new mutex table, making the locking combination insufficient, leading to possible race windows that could cause corruption and undefined behavior. This update fixes the problem by introducing a required spinlock to the region tracking functions for proper serialization. The problem only affects software using huge pages through hugetlb interface. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2015:2552-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2552.html Issue date: 2015-12-08 CVE Names: CVE-2015-5307 CVE-2015-8104 =====================================================================
- Summary:
Updated kernel packages that fix two security issues, several bugs, and add one enhancement are now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
- Relevant releases/architectures:
Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
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It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) and #DB (debug exception) is handled. A privileged user inside a guest could use these flaws to create denial of service conditions on the host kernel. (CVE-2015-5307, CVE-2015-8104, Important)
Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the CVE-2015-5307 issue.
This update also fixes the following bugs:
-
On Intel Xeon v5 platforms, the processor frequency was always tied to the highest possible frequency. Switching p-states on these client platforms failed. This update sets the idle frequency, busy frequency, and processor frequency values by determining the range and adjusting the minimal and maximal percent limit values. Now, switching p-states on the aforementioned client platforms proceeds successfully. (BZ#1273926)
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Due to a validation error of in-kernel memory-mapped I/O (MMIO) tracing, a VM became previously unresponsive when connected to Red Hat Enterprise Virtualization Hypervisor. The provided patch fixes this bug by dropping the check in MMIO handler, and a VM continues running as expected. (BZ#1275150)
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Due to retry-able command errors, the NVMe driver previously leaked I/O descriptors and DMA mappings. As a consequence, the kernel could become unresponsive during the hot-unplug operation if a driver was removed. This update fixes the driver memory leak bug on command retries, and the kernel no longer hangs in this situation. (BZ#1279792)
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The hybrid_dma_data() function was not initialized before use, which caused an invalid memory access when hot-plugging a PCI card. As a consequence, a kernel oops occurred. The provided patch makes sure hybrid_dma_data() is initialized before use, and the kernel oops no longer occurs in this situation. (BZ#1279793)
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When running PowerPC (PPC) KVM guests and the host was experiencing a lot of page faults, for example because it was running low on memory, the host sometimes triggered an incorrect kind of interrupt in the guest: a data storage exception instead of a data segment exception. This caused a kernel panic of the PPC KVM guest. With this update, the host kernel synthesizes a segment fault if the corresponding Segment Lookaside Buffer (SLB) lookup fails, which prevents the kernel panic from occurring. (BZ#1281423)
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The kernel accessed an incorrect area of the khugepaged process causing Logical Partitioning (LPAR) to become unresponsive, and an oops occurred in medlp5. The backported upstream patch prevents an LPAR hang, and the oops no longer occurs. (BZ#1281424)
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When the sctp module was loaded and a route to an association endpoint was removed after receiving an Out-of-The-Blue (OOTB) chunk but before incrementing the "dropped because of missing route" SNMP statistic, a Null Pointer Dereference kernel panic previously occurred. This update fixes the race condition between OOTB response and route removal. (BZ#1281426)
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The cpuscaling test of the certification test suite previously failed due to a rounding bug in the intel-pstate driver. This bug has been fixed and the cpuscaling test now passes. (BZ#1281491)
All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.
- Solution:
Before applying this update, make sure all previously released errata relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258
- Bugs fixed (https://bugzilla.redhat.com/):
1277172 - CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception 1278496 - CVE-2015-8104 virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception
- Package List:
Red Hat Enterprise Linux Client (v. 7):
Source: kernel-3.10.0-327.3.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm
x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: kernel-3.10.0-327.3.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm
x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: kernel-3.10.0-327.3.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm
ppc64: kernel-3.10.0-327.3.1.el7.ppc64.rpm kernel-bootwrapper-3.10.0-327.3.1.el7.ppc64.rpm kernel-debug-3.10.0-327.3.1.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-327.3.1.el7.ppc64.rpm kernel-devel-3.10.0-327.3.1.el7.ppc64.rpm kernel-headers-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.ppc64.rpm perf-3.10.0-327.3.1.el7.ppc64.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm python-perf-3.10.0-327.3.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm
ppc64le: kernel-3.10.0-327.3.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debug-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.3.1.el7.ppc64le.rpm kernel-devel-3.10.0-327.3.1.el7.ppc64le.rpm kernel-headers-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-libs-3.10.0-327.3.1.el7.ppc64le.rpm perf-3.10.0-327.3.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm python-perf-3.10.0-327.3.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm
s390x: kernel-3.10.0-327.3.1.el7.s390x.rpm kernel-debug-3.10.0-327.3.1.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.s390x.rpm kernel-debug-devel-3.10.0-327.3.1.el7.s390x.rpm kernel-debuginfo-3.10.0-327.3.1.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-327.3.1.el7.s390x.rpm kernel-devel-3.10.0-327.3.1.el7.s390x.rpm kernel-headers-3.10.0-327.3.1.el7.s390x.rpm kernel-kdump-3.10.0-327.3.1.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-327.3.1.el7.s390x.rpm kernel-kdump-devel-3.10.0-327.3.1.el7.s390x.rpm perf-3.10.0-327.3.1.el7.s390x.rpm perf-debuginfo-3.10.0-327.3.1.el7.s390x.rpm python-perf-3.10.0-327.3.1.el7.s390x.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.s390x.rpm
x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.ppc64.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64.rpm
ppc64le: kernel-debug-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debug-devel-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.ppc64le.rpm
x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source: kernel-3.10.0-327.3.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm kernel-doc-3.10.0-327.3.1.el7.noarch.rpm
x86_64: kernel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-devel-3.10.0-327.3.1.el7.x86_64.rpm kernel-headers-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm perf-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 7):
x86_64: kernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- References:
https://access.redhat.com/security/cve/CVE-2015-5307 https://access.redhat.com/security/cve/CVE-2015-8104 https://access.redhat.com/security/updates/classification/#important
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2015 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 7.1) - ppc64, ppc64le, s390x, x86_64
-
(CVE-2015-8104, Important)
-
A use-after-free flaw was found in the way the Linux kernel's key management subsystem handled keyring object reference counting in certain error path of the join_session_keyring() function. A local, unprivileged user could use this flaw to escalate their privileges on the system. (CVE-2016-0728, Important)
-
It was found that the fix for CVE-2015-1805 incorrectly kept buffer offset and buffer length in sync on a failed atomic read, potentially resulting in a pipe buffer state corruption.
Bug fixes:
-
NMI watchdog of guests using legacy LVT0-based NMI delivery did not work with APICv. Now, NMI works with LVT0 regardless of APICv. (BZ#1244726)
-
Parallel file-extending direct I/O writes could previously race to update the size of the file. If they executed out-of-order, the file size could move backwards and push a previously completed write beyond the end of the file, causing it to be lost. (BZ#1258942)
-
The GHES NMI handler had a global spin lock that significantly increased the latency of each perf sample collection. This update simplifies locking inside the handler. (BZ#1280200)
-
Sometimes, iptables rules are updated along with ip rules, and routes are reloaded. Previously, skb->sk was mistakenly attached to some IPv6 forwarding traffic packets, which could cause kernel panic. Now, such packets are checked and not processed. (BZ#1281700)
-
The NUMA node was not reported for PCI adapters, which affected every POWER system deployed with Red Hat Enterprise Linux 7 and caused significant decrease in the system performance. (BZ#1283525)
-
Processing packets with a lot of different IPv6 source addresses caused the kernel to return warnings concerning soft-lockups due to high lock contention and latency increase. (BZ#1285369)
-
Running edge triggered interrupts with an ack notifier when simultaneously reconfiguring the Intel I/O IOAPIC did not work correctly, so EOI in the interrupt did not cause a VM to exit if APICv was enabled. Consequently, the VM sometimes became unresponsive. (BZ#1287001)
-
Block device readahead was artificially limited, so the read performance was poor, especially on RAID devices. Now, per-device readahead limits are used for each device, which has improved read performance. (BZ#1287548)
-
Identical expectations could not be tracked simultaneously even if they resided in different connection tracking zones. Now, an expectation insert attempt is rejected only if the zone is also identical. (BZ#1290093)
-
The storvsc kernel driver for Microsoft Hyper-V storage was setting incorrect SRB flags, and Red Hat Enterprise Linux 7 guests running on Microsoft Hyper-V were experiencing slow I/O as well as I/O failures when they were connected to a virtual SAN. Now, SRB flags are set correctly. (BZ#1290095)
-
When a NUMA system with no memory in node 0 was used, the system terminated unexpectedly during boot or when using OpenVSwitch. Now, the kernel tries to allocate memory from other nodes when node 0 is not present. (BZ#1300950)
Enhancement:
- IPsec has been updated to provide many fixes and some enhancements. Of particular note is the ability to match on outgoing interfaces. (BZ#1287407)
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"data": "The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c. Linux Kernel is prone to a denial-of-service vulnerability. \nAn attacker with a guest account can exploit this issue to cause an infinite loop in the host, denying service to legitimate users. \n\nThis update also fixes the following bugs:\n\n* When doing TSO/GSO in the presence of VLAN headers on a macvtap device,\nthe header offsets were incorrectly calculated. As a consequence, when 2\nguests on the same host communicated over a guest configured VLAN,\nperformance dropped to about 1 Mbps. A set of patches has been provided to\nfix this bug, and network performance with VLAN tags now works with optimal\nperformance. (BZ#1215914)\n\n* Prior to this update, TSO acceleration features have been removed from\nthe VLAN device which caused that VLAN performance on top of a virtio\ndevice was much lower than that of a virtio device itself. This update\nre-enables TSO acceleration features, and performance of VLAN devices on\ntop of a virtio device has thus been restored. (BZ#1240988)\n\n* With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor\nAdvertisement (UNA) was previously sent using the link global IPv6 address\nas source address. The underlying source code has been patched, and, after\nthe failover in bonding, UNA is sent using both the corresponding link IPv6\naddress and global IPv6 address of bond0 and bond0.vlan. \nThe problem could be seen for example with software mapping or re-mapping\nhugetlb areas with concurrent threads reading/writing to same areas causing\npage faults. \n(BZ#1274597)\n\n* Previously, VLAN stacked on the macvlan or macvtap device did not work\nfor devices that implement and use VLAN filters. As a consequence, macvtap\npassthrough mode failed to transfer VLAN packets over the be2net driver. \nThis update implements VLAN ndo calls to the macvlan driver to pass\nappropriate VLAN tag IDs to lower devices. As a result, macvtap transfers\nVLAN packets over be2net successfully. Content-Disposition: inline\n\n\n============================================================================\nUbuntu Security Notice USN-2842-2\nDecember 17, 2015\n\nlinux-lts-vivid vulnerabilities\n============================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 14.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in the kernel. \n\nSoftware Description:\n- linux-lts-vivid: Linux hardware enablement kernel from Vivid\n\nDetails:\n\nJan Beulich discovered that the KVM svm hypervisor implementation in the\nLinux kernel did not properly catch Debug exceptions on AMD processors. (CVE-2015-8104)\n\n=E9=83=AD=E6=B0=B8=E5=88=9A discovered that the ppp implementation in the Linux kernel did\nnot ensure that certain slot numbers are valid. (CVE-2015-7799)\n\nIt was discovered that the virtual video osd test driver in the Linux\nkernel did not properly initialize data structures. (CVE-2015-7884)\n\nIt was discovered that the driver for Digi Neo and ClassicBoard devices did\nnot properly initialize data structures. (CVE-2015-7885)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 14.04 LTS:\n linux-image-3.19.0-41-generic 3.19.0-41.46~14.04.2\n linux-image-3.19.0-41-generic-lpae 3.19.0-41.46~14.04.2\n linux-image-3.19.0-41-lowlatency 3.19.0-41.46~14.04.2\n linux-image-3.19.0-41-powerpc-e500mc 3.19.0-41.46~14.04.2\n linux-image-3.19.0-41-powerpc-smp 3.19.0-41.46~14.04.2\n linux-image-3.19.0-41-powerpc64-emb 3.19.0-41.46~14.04.2\n linux-image-3.19.0-41-powerpc64-smp 3.19.0-41.46~14.04.2\n\nAfter a standard system update you need to reboot your computer to make\nall the necessary changes. \n\nATTENTION: Due to an unavoidable ABI change the kernel updates have\nbeen given a new version number, which requires you to recompile and\nreinstall all third party kernel modules you might have installed. If\nyou use linux-restricted-modules, you have to update that package as\nwell to get modules which work with the new kernel version. Unless you\nmanually uninstalled the standard kernel metapackages (e.g. linux-generic,\nlinux-server, linux-powerpc), a standard system upgrade will automatically\nperform this as well. \n\n* A flaw was found in the way the Linux kernel\u0027s file system implementation\nhandled rename operations in which the source was inside and the\ndestination was outside of a bind mount. (CVE-2015-7613,\nImportant)\n\n* It was found that the Linux kernel\u0027s keys subsystem did not correctly\ngarbage collect uninstantiated keyrings. \n\nThis update also fixes the following bugs:\n\n* Previously, Human Interface Device (HID) ran a report on an unaligned\nbuffer, which could cause a page fault interrupt and an oops when the end\nof the report was read. This update fixes this bug by padding the end of\nthe report with extra bytes, so the reading of the report never crosses a\npage boundary. As a result, a page fault and subsequent oops no longer\noccur. (BZ#1268203)\n\n* The NFS client was previously failing to detect a directory loop for some\nNFS server directory structures. This failure could cause NFS inodes to\nremain referenced after attempting to unmount the file system, leading to a\nkernel crash. Loop checks have been added to VFS, which effectively\nprevents this problem from occurring. (BZ#1272858)\n\n* Due to a race whereby the nfs_wb_pages_cancel() and\nnfs_commit_release_pages() calls both removed a request from the nfs_inode\nstruct type, the kernel panicked with negative nfs_inode.npages count. \nThe provided upstream patch performs the required serialization by holding\nthe inode i_lock over the check of PagePrivate and locking the request,\nthus preventing the race and kernel panic from occurring. (BZ#1273721)\n\n* Due to incorrect URB_ISO_ASAP semantics, playing an audio file using a\nUSB sound card could previously fail for some hardware configurations. (BZ#1273916)\n\n* Inside hugetlb, region data structures were protected by a combination of\na memory map semaphore and a single hugetlb instance mutex. However, a\npage-fault scalability improvement backported to the kernel on previous\nreleases removed the single hugetlb instance mutex and introduced a new\nmutex table, making the locking combination insufficient, leading to\npossible race windows that could cause corruption and undefined behavior. \nThis update fixes the problem by introducing a required spinlock to the\nregion tracking functions for proper serialization. The problem only\naffects software using huge pages through hugetlb interface. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n=====================================================================\n Red Hat Security Advisory\n\nSynopsis: Important: kernel security and bug fix update\nAdvisory ID: RHSA-2015:2552-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://rhn.redhat.com/errata/RHSA-2015-2552.html\nIssue date: 2015-12-08\nCVE Names: CVE-2015-5307 CVE-2015-8104 \n=====================================================================\n\n1. Summary:\n\nUpdated kernel packages that fix two security issues, several bugs, and add\none enhancement are now available for Red Hat Enterprise Linux 7. \n\nRed Hat Product Security has rated this update as having Important security\nimpact. Common Vulnerability Scoring System (CVSS) base scores, which give\ndetailed severity ratings, are available for each vulnerability from the\nCVE links in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Client (v. 7) - noarch, x86_64\nRed Hat Enterprise Linux Client Optional (v. 7) - x86_64\nRed Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64\nRed Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64\nRed Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64\nRed Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 7) - x86_64\n\n3. \n\n* It was found that the x86 ISA (Instruction Set Architecture) is prone to\na denial of service attack inside a virtualized environment in the form of\nan infinite loop in the microcode due to the way (sequential) delivering of\nbenign exceptions such as #AC (alignment check exception) and #DB (debug\nexception) is handled. A privileged user inside a guest could use these\nflaws to create denial of service conditions on the host kernel. \n(CVE-2015-5307, CVE-2015-8104, Important)\n\nRed Hat would like to thank Ben Serebrin of Google Inc. for reporting the\nCVE-2015-5307 issue. \n\nThis update also fixes the following bugs:\n\n* On Intel Xeon v5 platforms, the processor frequency was always tied to\nthe highest possible frequency. Switching p-states on these client\nplatforms failed. This update sets the idle frequency, busy frequency, and\nprocessor frequency values by determining the range and adjusting the\nminimal and maximal percent limit values. Now, switching p-states on the\naforementioned client platforms proceeds successfully. (BZ#1273926)\n\n* Due to a validation error of in-kernel memory-mapped I/O (MMIO) tracing,\na VM became previously unresponsive when connected to Red Hat Enterprise\nVirtualization Hypervisor. The provided patch fixes this bug by dropping\nthe check in MMIO handler, and a VM continues running as expected. \n(BZ#1275150)\n\n* Due to retry-able command errors, the NVMe driver previously leaked I/O\ndescriptors and DMA mappings. As a consequence, the kernel could become\nunresponsive during the hot-unplug operation if a driver was removed. \nThis update fixes the driver memory leak bug on command retries, and the\nkernel no longer hangs in this situation. (BZ#1279792)\n\n* The hybrid_dma_data() function was not initialized before use, which\ncaused an invalid memory access when hot-plugging a PCI card. As a\nconsequence, a kernel oops occurred. The provided patch makes sure\nhybrid_dma_data() is initialized before use, and the kernel oops no longer\noccurs in this situation. (BZ#1279793)\n\n* When running PowerPC (PPC) KVM guests and the host was experiencing a lot\nof page faults, for example because it was running low on memory, the host\nsometimes triggered an incorrect kind of interrupt in the guest: a data\nstorage exception instead of a data segment exception. This caused a kernel\npanic of the PPC KVM guest. With this update, the host kernel synthesizes a\nsegment fault if the corresponding Segment Lookaside Buffer (SLB) lookup\nfails, which prevents the kernel panic from occurring. (BZ#1281423)\n\n* The kernel accessed an incorrect area of the khugepaged process causing\nLogical Partitioning (LPAR) to become unresponsive, and an oops occurred in\nmedlp5. The backported upstream patch prevents an LPAR hang, and the oops\nno longer occurs. (BZ#1281424)\n\n* When the sctp module was loaded and a route to an association endpoint\nwas removed after receiving an Out-of-The-Blue (OOTB) chunk but before\nincrementing the \"dropped because of missing route\" SNMP statistic, a Null\nPointer Dereference kernel panic previously occurred. This update fixes the\nrace condition between OOTB response and route removal. (BZ#1281426)\n\n* The cpuscaling test of the certification test suite previously failed due\nto a rounding bug in the intel-pstate driver. This bug has been fixed and\nthe cpuscaling test now passes. (BZ#1281491)\n\nAll kernel users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. The system must be\nrebooted for this update to take effect. \n\n4. Solution:\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied. \n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1277172 - CVE-2015-5307 virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception\n1278496 - CVE-2015-8104 virt: guest to host DoS by triggering an infinite loop in microcode via #DB exception\n\n6. Package List:\n\nRed Hat Enterprise Linux Client (v. 7):\n\nSource:\nkernel-3.10.0-327.3.1.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.3.1.el7.noarch.rpm\nkernel-doc-3.10.0-327.3.1.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debug-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-devel-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-headers-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.3.1.el7.x86_64.rpm\nperf-3.10.0-327.3.1.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\npython-perf-3.10.0-327.3.1.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Client Optional (v. 7):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\n\nRed Hat Enterprise Linux ComputeNode (v. 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7):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.3.1.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.3.1.el7.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2015-5307\nhttps://access.redhat.com/security/cve/CVE-2015-8104\nhttps://access.redhat.com/security/updates/classification/#important\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2015 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niD8DBQFWZubYXlSAg2UNWIIRAsvDAJ46kkXWcTnnN5EtbqyO0fc2+uZZawCeNnnr\n2T4VNHyutcGOZycd46ObXOk=\n=v6PE\n-----END PGP SIGNATURE-----\n\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. 7.1) - ppc64, ppc64le, s390x, x86_64\n\n3. (CVE-2015-8104, Important)\n\n* A use-after-free flaw was found in the way the Linux kernel\u0027s key\nmanagement subsystem handled keyring object reference counting in certain\nerror path of the join_session_keyring() function. A local, unprivileged\nuser could use this flaw to escalate their privileges on the system. \n(CVE-2016-0728, Important)\n\n* It was found that the fix for CVE-2015-1805 incorrectly kept buffer\noffset and buffer length in sync on a failed atomic read, potentially\nresulting in a pipe buffer state corruption. \n\nBug fixes:\n\n* NMI watchdog of guests using legacy LVT0-based NMI delivery did not work\nwith APICv. Now, NMI works with LVT0 regardless of APICv. (BZ#1244726)\n\n* Parallel file-extending direct I/O writes could previously race to update\nthe size of the file. If they executed out-of-order, the file size could\nmove backwards and push a previously completed write beyond the end of the\nfile, causing it to be lost. (BZ#1258942)\n\n* The GHES NMI handler had a global spin lock that significantly increased\nthe latency of each perf sample collection. This update simplifies locking\ninside the handler. (BZ#1280200)\n\n* Sometimes, iptables rules are updated along with ip rules, and routes are\nreloaded. Previously, skb-\u003esk was mistakenly attached to some IPv6\nforwarding traffic packets, which could cause kernel panic. Now, such\npackets are checked and not processed. (BZ#1281700)\n\n* The NUMA node was not reported for PCI adapters, which affected every\nPOWER system deployed with Red Hat Enterprise Linux 7 and caused\nsignificant decrease in the system performance. (BZ#1283525)\n\n* Processing packets with a lot of different IPv6 source addresses caused\nthe kernel to return warnings concerning soft-lockups due to high lock\ncontention and latency increase. (BZ#1285369)\n\n* Running edge triggered interrupts with an ack notifier when\nsimultaneously reconfiguring the Intel I/O IOAPIC did not work correctly,\nso EOI in the interrupt did not cause a VM to exit if APICv was enabled. \nConsequently, the VM sometimes became unresponsive. (BZ#1287001)\n\n* Block device readahead was artificially limited, so the read performance\nwas poor, especially on RAID devices. Now, per-device readahead limits are\nused for each device, which has improved read performance. (BZ#1287548)\n\n* Identical expectations could not be tracked simultaneously even if they\nresided in different connection tracking zones. Now, an expectation insert\nattempt is rejected only if the zone is also identical. (BZ#1290093)\n\n* The storvsc kernel driver for Microsoft Hyper-V storage was setting\nincorrect SRB flags, and Red Hat Enterprise Linux 7 guests running on\nMicrosoft Hyper-V were experiencing slow I/O as well as I/O failures when\nthey were connected to a virtual SAN. Now, SRB flags are set correctly. \n(BZ#1290095)\n\n* When a NUMA system with no memory in node 0 was used, the system\nterminated unexpectedly during boot or when using OpenVSwitch. Now, the\nkernel tries to allocate memory from other nodes when node 0 is not\npresent. (BZ#1300950)\n\nEnhancement:\n\n* IPsec has been updated to provide many fixes and some enhancements. \nOf particular note is the ability to match on outgoing interfaces. \n(BZ#1287407)\n\n4",
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"db": "CNNVD",
"id": "CNNVD-201511-259"
}
],
"trust": 0.6
}
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.