ghsa-vrx5-g53m-hhm7
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-07-03 18:42
Severity ?
5.1 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: SVM: fix missing sev_decommission in sev_receive_start

DECOMMISSION the current SEV context if binding an ASID fails after RECEIVE_START. Per AMD's SEV API, RECEIVE_START generates a new guest context and thus needs to be paired with DECOMMISSION:

 The RECEIVE_START command is the only command other than the LAUNCH_START
 command that generates a new guest context and guest handle.

The missing DECOMMISSION can result in subsequent SEV launch failures, as the firmware leaks memory and might not able to allocate more SEV guest contexts in the future.

Note, LAUNCH_START suffered the same bug, but was previously fixed by commit 934002cd660b ("KVM: SVM: Call SEV Guest Decommission if ASID binding fails").

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2021-47389"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-772"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:24Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: fix missing sev_decommission in sev_receive_start\n\nDECOMMISSION the current SEV context if binding an ASID fails after\nRECEIVE_START.  Per AMD\u0027s SEV API, RECEIVE_START generates a new guest\ncontext and thus needs to be paired with DECOMMISSION:\n\n     The RECEIVE_START command is the only command other than the LAUNCH_START\n     command that generates a new guest context and guest handle.\n\nThe missing DECOMMISSION can result in subsequent SEV launch failures,\nas the firmware leaks memory and might not able to allocate more SEV\nguest contexts in the future.\n\nNote, LAUNCH_START suffered the same bug, but was previously fixed by\ncommit 934002cd660b (\"KVM: SVM: Call SEV Guest Decommission if ASID\nbinding fails\").",
  "id": "GHSA-vrx5-g53m-hhm7",
  "modified": "2024-07-03T18:42:51Z",
  "published": "2024-05-21T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47389"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.