github - ghsa-m46m-jr5m-g95h

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"
    }
  ]
}

cve-2021-29657

Vulnerability from cvelistv5

Published

2021-07-22 16:44

Modified

2024-08-03 22:11

Severity ?

Summary

References

▼	URL	Tags
	http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html	x_refsource_MISC
	https://bugs.chromium.org/p/project-zero/issues/detail?id=2177	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134	x_refsource_CONFIRM
	https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12	x_refsource_CONFIRM
	https://security.netapp.com/advisory/ntap-20210902-0008/	x_refsource_CONFIRM

Impacted products

Vendor

Product

Version

▼

n/a

Version: n/a

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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