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CVE-2026-89777: Linux

8.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: vfio/pci: clear vdev->msi_perm after freeing it on init failure vfio_msi_cap_len() lazily allocates the per-device MSI permission table: vdev->msi_perm = kmalloc_obj(struct perm_bits, GFP_KERNEL_ACCOUNT); if (!vdev->msi_perm) return -ENOMEM; ret = init_pci_cap_msi_perm(vdev->msi_perm, len, flags); if (ret) { kfree(vdev->msi_perm); return ret; /* vdev->msi_perm left dangling */ } When init_pci_cap_msi_perm() -> alloc_perm_bits() fails with -ENOMEM, the error path frees vdev->msi_perm but leaves the freed pointer stored in it. vdev->msi_perm is not re-zeroed later because struct vfio_pci_core_device is per-device and persists across open/close cycles, and the vfio_config_init() error path returns without calling vfio_config_free(). So the dangling pointer outlives the failed open. That leads to two use-after-frees on the same device: 1. Reuse. The next vfio_config_init() sees the stale pointer at "if (vdev->msi_perm) return len;" and reuses the freed object. MSI config accesses in vfio_pci_config_rw_single() then dereference and call the freed perm->readfn / perm->writefn function pointers. 2. Double free. A later vfio_config_free() runs free_perm_bits() and kfree() on the already-freed object. Fix it by NULLing vdev->msi_perm after the kfree(), matching the NULL-after-free discipline already used in free_perm_bits() and vfio_config_free(). BUG: KASAN: slab-use-after-free in vfio_pci_config_rw_single (drivers/vfio/pci/vfio_pci_config.c:1961) Read of size 8 at addr ffff88800fcc88d0 by task exploit/143 Call Trace: ... kasan_report (mm/kasan/report.c:595) vfio_pci_config_rw_single (drivers/vfio/pci/vfio_pci_config.c:1961) vfio_pci_config_rw (drivers/vfio/pci/vfio_pci_config.c:1986) vfio_pci_rw (drivers/vfio/pci/vfio_pci_core.c:1599) vfs_read (fs/read_write.c:572) __x64_sys_pread64 (fs/read_write.c:764) do_syscall_64 (arch/x86/entry/syscall_6

    Засегнати продукти

    • Linux Linux: 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди eb84cd81040e58dd05ac190f561f2115e3367249; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди f0eea8f9013676b42289ec35941e848b8a543e19; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди d665a1688af7f8fefd7c0eb04f2a37122ce007f4; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди 25cdd2a492d868cff1e519a60fe282909c52d385; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди 812f1db7f0755a19ef16ecdc5cec51bcabc5eda5; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди 533d0c5feef85ee6404b9f41d5564fac6971a008; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди fda8fb7e8179561693a786a7af593f6b944a21c1; 30ea32ab1951c80c6113f300fce2c70cd12659e4 преди dc77acfeb979dded39b247b60fef0399536bfa77; ac370e3d1f3b01519d2705cd5815d1c9d0a8812b; be363e27ec3c3a99793da2be6c07eafb95709c6b; f1b10ba5739440ca51d66f0b2949cead88d2dd02; dde3433de9a067a33d67d65b9093cad3e043e49e; 4.4.203 преди 4.5; 4.9.203 преди 4.10; 4.14.155 преди 4.15; 4.19.85 преди 4.20
    • Linux Linux: 4.20; преди 4.20; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 16 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89777: Linux | freedomonline.bg