Vulnerability-Lookup

GHSA-VRX5-G53M-HHM7

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-07-03 18:42

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").

Severity ?

5.1 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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{
  "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"
    }
  ]
}

CVE-2021-47389 (GCVE-0-2021-47389)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2025-05-04 07:09

Title

KVM: SVM: fix missing sev_decommission in sev_receive_start

Summary

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").

Severity ?

5.1 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CWE

CWE-772 - Missing Release of Resource after Effective Lifetime

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/efd7866e114dcb44f…
	https://git.kernel.org/stable/c/f1815e0aa770f2127…

Impacted products

Vendor

Product

Version

Linux

Affected: af43cbbf954b50ca97d5e7bb56c2edc6ffd209ef , < efd7866e114dcb44f86d151e843f8276b7efbc67 (git)
Affected: af43cbbf954b50ca97d5e7bb56c2edc6ffd209ef , < f1815e0aa770f2127c5df31eb5c2f0e37b60fa77 (git)

Linux

Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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GHSA-VRX5-G53M-HHM7

CVE-2021-47389 (GCVE-0-2021-47389)

Tags

Sightings

Nomenclature