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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: make apf token non-zero to fix bug\n\nIn current async pagefault logic, when a page is ready, KVM relies on\nkvm_arch_can_dequeue_async_page_present() to determine whether to deliver\na READY event to the Guest. This function test token value of struct\nkvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a\nREADY event is finished by Guest. If value is zero meaning that a READY\nevent is done, so the KVM can deliver another.\nBut the kvm_arch_setup_async_pf() may produce a valid token with zero\nvalue, which is confused with previous mention and may lead the loss of\nthis READY event.\n\nThis bug may cause task blocked forever in Guest:\n INFO: task stress:7532 blocked for more than 1254 seconds.\n       Not tainted 5.10.0 #16\n \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n task:stress          state:D stack:    0 pid: 7532 ppid:  1409\n flags:0x00000080\n Call Trace:\n  __schedule+0x1e7/0x650\n  schedule+0x46/0xb0\n  kvm_async_pf_task_wait_schedule+0xad/0xe0\n  ? exit_to_user_mode_prepare+0x60/0x70\n  __kvm_handle_async_pf+0x4f/0xb0\n  ? asm_exc_page_fault+0x8/0x30\n  exc_page_fault+0x6f/0x110\n  ? asm_exc_page_fault+0x8/0x30\n  asm_exc_page_fault+0x1e/0x30\n RIP: 0033:0x402d00\n RSP: 002b:00007ffd31912500 EFLAGS: 00010206\n RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0\n RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0\n RBP: 00000000021262b0 R08: 0000000000000003 R09: 0000000000000086\n R10: 00000000000000eb R11: 00007fefbdf2baa0 R12: 0000000000000000\n R13: 0000000000000002 R14: 000000000007d000 R15: 0000000000001000"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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              "value": "AV:L - The bug is reached only when a KVM guest takes a paravirtual async page fault (KVM_RUN \u2192 faultin \u2192 kvm_arch_setup_async_pf), which requires local code execution inside a VM or local /dev/kvm use\u2014not remote packet processing.\nAC:L - On overcommitted KVM hosts (common cloud deployments) async PF is routinely exercised; token 0 is produced deterministically on vCPU 0 when (id\u003c\u003c12)==0, and concurrent READY completions that drop that event are driven by attacker/workload-controlled multi-threaded memory stress, as in the original hang report.\nPR:N - No host privileges are required\u2014an ordinary tenant VM triggers this via normal guest userspace page faults after the guest kernel enables MSR_KVM_ASYNC_PF_EN, matching other guest-triggerable KVM DoS scores (PR:N relative to the host).\nUI:N - No separate victim action is needed; guest memory accesses under host reclaim/async PF delivery alone hit the vulnerable token path.\nS:C - The vulnerable code is host KVM MMU/async-PF handling, but the impact is permanent denial of guest task/VM progress across the hypervisor\u2013guest (and nested L1/L2) security boundary, consistent with other host-KVM guest-availability DoS scorings.\nC:N - This is solely a confused zero token versus the READY-slot-empty sentinel causing a lost wakeup; there is no OOB read, UAF, or other disclosure primitive.\nI:N - No memory corruption, write primitive, or control-flow hijack occurs\u2014only failure to deliver a READY notification for a valid token value of zero.\nA:H - A lost READY leaves the guest task blocked forever in TASK_UNINTERRUPTIBLE (D state), which is a complete denial of that workload\u2019s availability and can stall nested guests depending on the hung threads."
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          "url": "https://git.kernel.org/stable/c/62040f5cd7d937de547836e747b6aa8212fec573"
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        {
          "url": "https://git.kernel.org/stable/c/6f3c1fc53d86d580d8d6d749c4af23705e4f6f79"
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      ],
      "title": "KVM: x86/mmu: make apf token non-zero to fix bug",
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    "datePublished": "2024-08-22T03:30:14.027Z",
    "dateReserved": "2024-08-22T01:27:53.623Z",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vivid: fix compose size exceed boundary\n\nsyzkaller found a bug:\n\n BUG: unable to handle page fault for address: ffffc9000a3b1000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 100000067 P4D 100000067 PUD 10015f067 PMD 1121ca067 PTE 0\n Oops: 0002 [#1] PREEMPT SMP\n CPU: 0 PID: 23489 Comm: vivid-000-vid-c Not tainted 6.1.0-rc1+ #512\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n RIP: 0010:memcpy_erms+0x6/0x10\n[...]\n Call Trace:\n  \u003cTASK\u003e\n  ? tpg_fill_plane_buffer+0x856/0x15b0\n  vivid_fillbuff+0x8ac/0x1110\n  vivid_thread_vid_cap_tick+0x361/0xc90\n  vivid_thread_vid_cap+0x21a/0x3a0\n  kthread+0x143/0x180\n  ret_from_fork+0x1f/0x30\n  \u003c/TASK\u003e\n\nThis is because we forget to check boundary after adjust compose-\u003eheight\nint V4L2_SEL_TGT_CROP case. Add v4l2_rect_map_inside() to fix this problem\nfor this case."
        }
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              "value": "AV:L - The bug is reached only via local V4L2 ioctls (VIDIOC_S_SELECTION / STREAMON) on the vivid /dev/videoN node; there is no network or adjacent-protocol path into vivid_vid_cap_s_selection or the capture kthread fill path.\nAC:L - An attacker-controlled, race-free ioctl sequence (enable crop+compose+scaler, set a crop that expands compose past fmt) deterministically leaves compose outside the buffer bounds; syzkaller reproduces the page-fault OOB write reliably.\nPR:L - Opening the vivid video node and issuing S_SELECTION requires no capability check\u2014only video-group or seat uaccess on /dev/videoN\u2014and crop/compose/scaler are ordinary unprivileged V4L2 controls (default-enabled).\nUI:N - The attacker opens the device, configures selection/format/streaming themselves; the OOB write then runs in the vivid capture kthread with no victim action.\nS:U - The out-of-bounds write corrupts kernel memory within the host kernel\u2019s security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Heap/vmalloc memory corruption from the oversized compose write is leverageable for kernel information disclosure (same class as CVE-2025-38226), and related loop/copy paths can surface adjacent data into attacker-readable capture buffers.\nI:H - This is an attacker-triggered out-of-bounds write in tpg_fill_plane_buffer (memcpy past the allocated frame buffer via compose.top/height/left), a classic heap corruption primitive suitable for control-flow hijacking.\nA:H - The demonstrated effect is a kernel oops (supervisor write page fault in memcpy_erms during tpg_fill_plane_buffer in the vivid kthread), which can panic the machine and is re-triggerable at will."
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