ghsa-m46m-jr5m-g95h
Vulnerability from github
Published
2022-05-24 19:08
Modified
2023-05-19 18:30
Severity ?
7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Details

arch/x86/kvm/svm/nested.c in the Linux kernel before 5.11.12 has a use-after-free in which an AMD KVM guest can bypass access control on host OS MSRs when there are nested guests, aka CID-a58d9166a756. This occurs because of a TOCTOU race condition associated with a VMCB12 double fetch in nested_svm_vmrun.

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{
   affected: [],
   aliases: [
      "CVE-2021-29657",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-367",
         "CWE-416",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2021-07-22T17:15:00Z",
      severity: "HIGH",
   },
   details: "arch/x86/kvm/svm/nested.c in the Linux kernel before 5.11.12 has a use-after-free in which an AMD KVM guest can bypass access control on host OS MSRs when there are nested guests, aka CID-a58d9166a756. This occurs because of a TOCTOU race condition associated with a VMCB12 double fetch in nested_svm_vmrun.",
   id: "GHSA-m46m-jr5m-g95h",
   modified: "2023-05-19T18:30:23Z",
   published: "2022-05-24T19:08:58Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2021-29657",
      },
      {
         type: "WEB",
         url: "https://bugs.chromium.org/p/project-zero/issues/detail?id=2177",
      },
      {
         type: "WEB",
         url: "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134",
      },
      {
         type: "WEB",
         url: "https://security.netapp.com/advisory/ntap-20210902-0008",
      },
      {
         type: "WEB",
         url: "http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
         type: "CVSS_V3",
      },
   ],
}


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