CVE-2022-48943 — KVM: x86/mmu: make apf token non-zero to fix bug

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86/mmu: make apf token non-zero to fix bug

In current async pagefault logic, when a page is ready, KVM relies on kvm_arch_can_dequeue_async_page_present() to determine whether to deliver a READY event to the Guest. This function test token value of struct kvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a READY event is finished by Guest. If value is zero meaning that a READY event is done, so the KVM can deliver another. But the kvm_arch_setup_async_pf() may produce a valid token with zero value, which is confused with previous mention and may lead the loss of this READY event.

This bug may cause task blocked forever in Guest: INFO: task stress:7532 blocked for more than 1254 seconds. Not tainted 5.10.0 #16 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:stress state:D stack: 0 pid: 7532 ppid: 1409 flags:0x00000080 Call Trace: __schedule+0x1e7/0x650 schedule+0x46/0xb0 kvm_async_pf_task_wait_schedule+0xad/0xe0 ? exit_to_user_mode_prepare+0x60/0x70 __kvm_handle_async_pf+0x4f/0xb0 ? asm_exc_page_fault+0x8/0x30 exc_page_fault+0x6f/0x110 ? asm_exc_page_fault+0x8/0x30 asm_exc_page_fault+0x1e/0x30 RIP: 0033:0x402d00 RSP: 002b:00007ffd31912500 EFLAGS: 00010206 RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0 RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0 RBP: 000000000212…

USN-7121-1 — linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-…

Affected: Ubuntu:Pro:16.04:LTS: linux-aws-hwe, Ubuntu:Pro:16.04:LTS: linux-azure, Ubuntu:Pro:16.04:LTS: linux-gcp, Ubuntu:Pro:16.04:LTS: linux-hwe, Ubuntu:Pro:18.04:LTS: linux, Ubuntu:Pro:18.04:LTS: linux-aws, Ubuntu:Pro:18.04:LTS: linux-azure-4.15, Ubuntu:Pro:18.04:LTS: linux-gcp-4.15, Ubuntu:Pro:18.04:LTS: linux-kvm, Ubuntu:Pro:18.04:LTS: linux-oracle

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM64 architecture; - S390 architecture; - x86 architecture; - Block layer subsystem; - Cryptographic API; - ATM drivers; - Device frequency scaling framework; - GPU drivers; - Hardware monitoring drivers; - VMware VMCI Driver; - Network drivers; - Device tree and open firmware driver; - SCSI drivers; - Greybus lights staging drivers; - BTRFS file system; - File systems infrastructure; - F2FS file system; - JFS file system; - NILFS2 file system; - Netfilter; - Memory management; - Ethernet bridge; - IPv6 networking; - IUCV driver; - Logical Link layer; - MAC80211 subsystem; - NFC subsystem; - Network traffic control; - Unix domain sockets; (CVE-2023-52614, CVE-2024-26633, CVE-2024-46758, CVE-2024-46723, CVE-2023-52502, CVE-2024-41059, CVE-2024-44987, CVE-2024-36020, CVE-2023-52599, CVE-2023-52639, CVE-2024-26668, CVE-2024-42094, CVE-2022-48938, CVE-2022-48733, CVE-2024-27397, CVE-2023-52578, CVE-2024-38560, CVE-2024-38538, CVE-2024-42310, CVE-2024-46722, CVE-2024-46800, CVE-2024-41095, CVE-2024-42104, CVE-2024-35877, CVE-2022-48943, CVE-2024-46743, CVE-2023-52531, CVE-2024-46757, CVE-2024-36953, CVE-2024-46756, CVE-2024-38596, CVE-2023-52612, CVE-2024-38637, CVE-2024-41071, CVE-2024-46759, CVE-2024-43882, CVE-2024-26675, CVE-2024-43854, CV…

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CVE-2022-48943 — KVM: x86/mmu: make apf token non-zero to fix bug

USN-7121-1 — linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-…