Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - vhost_vdpa修正取消對應大型記憶體中的當機。在 vIOMMU 中測試時有時來賓會取消對應非常大的記憶體其將造成當機。若要修正此問題請新增函式 vhost_vdpa_general_unmap()。此函式只會取消對應 iotlb 中儲存的記憶體。呼叫追踪 [ 647.820144] ------------[ 截到此處]------------ [ 647.820848] drivers/iommu/intel/iommu 的核心錯誤。 c:1174! [ 647.821486] 無效 opcode
    0000 [#1] PREEMPT SMP PTI [ 647.822082] CPU10 PID 1181 通訊qemu-system-x86 未受污染的 6.0.0-rc1home_lulu_2452_lulu7_vhost+ #62 [ 647.823139] 硬體名稱 QEMU 標準 PC (Q35 + ICH9 2009)、BIOS rel-1.15.0-29-g6a62e0cb0dfe-prebuilt.qem4 [ 647.824365] RIP 0010:domain_unmap+0x48/0x110 [647.825424] 程式碼48 89 fb 8d 4c f6 1e 39 c1 0f 4f c8 83 e9 0c 83 f9 3f 7f 18 48 89 e8 48 d3 e8 48 85 c0 75 59 [ 647.828064] RSP 0018:ffffae5340c0bbf0 EFLAGS 00010202 [ 647.828973] RAX 0000000000000001 RBX
    ffff921793d10540 RCX 000000000000001b [ 647.830083] RDX 00000000080000ff RSI 0000000000000001 RDI
    ffff921793d10540 [ 647.831214] RBP: 0000000007fc0100 R08: ffffae5340c0bcd0 R09: 0000000000000003 [647.832388] R10: 0000007fc0100000 R11: 0000000000100000 R12: 00000000080000ff [ 647.833668] R13:
     R14ffffae5340c0bcd0  : ffff921793d10590 R15: 0000008000100000 [ 647.834782] FS: 00007f772ec90640(0000) GS:ffff921ce7a80000(0000) knlGS:0000000000000000 [ 647.836004] CS: 0010 DS: 0000 ES: 0000 CR0:
    0000000080050033 [ 647.836990] CR2: 00007f02c27a3a20 CR3: 0000000101b0c006 CR4: 0000000000372ee0 [647.838107] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 647.839283] DR3:
    000000000000000 DR600000000ffffe0ff0 DR7: 0000000000000400 [ 647.840666] 呼叫追踪[ 647.841437] <TASK> [ 647.842107] intel_iommu_unmap_pages+0x93/0x140 [ 647.843112] __iommu_unmap+0x91/0x1b0 [+x]a]/x95_unmap [+647.844003x] a 647.8448850x95_unmap ] vhost_vdpa_unmap+0x1de/0x1f0 [vhost_vdpa] [ 647.845985] vhost_vdpa_process_iotlb_msg+0xf0/0x90b [vhost_vdpa] [ 647.847235] ? _raw_spin_unlock+0x15/0x30 [647.848181] ? _copy_from_iter+0x8c/0x580 [ 647.849137] vhost_chr_write_iter+0xb3/0x430 [vhost] [647.850126] vfs_write+0x1e4/0x3a0 [ 647.850897] ksys_write+0x53/0xd0 [ 647.851688] do_syscall_64+0x3a/0x90 [ 647.852508] entry_SYSCALL_64_after_hwframe 0x63/0xcd [ 647.853457] RIP 0033:0x7f7734ef9f4f [647.854408] 程式碼 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 76 f8 ff 48 8b 54 24 18 48 8b 74 24 10 41 8 c8 [ 647.857217] RSP: 002b:00007f772ec8f040 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 647.858486] RAX: ffffffffffffffda RBX: 00000000fef00000 RCX: 00007f7734ef9f4f [ 647.859713] RDX: 0000000000000048 RSI:
    00007f772ec8f090 RDI0000000000000010 [ 647.860942] RBP 00007f772ec8f1a0 R080000000000000000 R09
    0000000000000000 [ 647.862206] R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000010 [647.863446] R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff01100000 [ 647.864692] </TASK> [647.865458] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs v] [ 647.874688] ---[ end trace 0000000000000000 ]--- (CVE-2022-50851)

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

偵測

Linux Distros 未修補的弱點：CVE-2022-50851

medium Nessus Plugin ID 280716

版本 1.12