Vulnerability-Lookup

GHSA-FVVW-8GW5-VW5F

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32

Details

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

KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish

Lock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as allowing userspace to manipulate and/or run a vCPU while its state is being synchronized would at best corrupt vCPU state, and at worst crash the host kernel.

Opportunistically assert that vcpu->mutex is held when synchronizing its VMSA (the SEV-ES path already locks vCPUs).

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31591"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:36Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish\n\nLock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as\nallowing userspace to manipulate and/or run a vCPU while its state is being\nsynchronized would at best corrupt vCPU state, and at worst crash the host\nkernel.\n\nOpportunistically assert that vcpu-\u003emutex is held when synchronizing its\nVMSA (the SEV-ES path already locks vCPUs).",
  "id": "GHSA-fvvw-8gw5-vw5f",
  "modified": "2026-04-24T15:32:34Z",
  "published": "2026-04-24T15:32:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31591"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30fd9d8c82087742168db779929d8be0459b0716"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c87938fc7d99a06a7e5477c45b4e5a4148f85d66"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-31591 (GCVE-0-2026-31591)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42

Title

KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish Lock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as allowing userspace to manipulate and/or run a vCPU while its state is being synchronized would at best corrupt vCPU state, and at worst crash the host kernel. Opportunistically assert that vcpu->mutex is held when synchronizing its VMSA (the SEV-ES path already locks vCPUs).

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/30fd9d8c820877421…
	https://git.kernel.org/stable/c/4df77742e8b9a6b93…
	https://git.kernel.org/stable/c/c87938fc7d99a06a7…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 30fd9d8c82087742168db779929d8be0459b0716 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c87938fc7d99a06a7e5477c45b4e5a4148f85d66 (git)

Linux

Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "30fd9d8c82087742168db779929d8be0459b0716",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "c87938fc7d99a06a7e5477c45b4e5a4148f85d66",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish\n\nLock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as\nallowing userspace to manipulate and/or run a vCPU while its state is being\nsynchronized would at best corrupt vCPU state, and at worst crash the host\nkernel.\n\nOpportunistically assert that vcpu-\u003emutex is held when synchronizing its\nVMSA (the SEV-ES path already locks vCPUs)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:42:18.276Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/30fd9d8c82087742168db779929d8be0459b0716"
        },
        {
          "url": "https://git.kernel.org/stable/c/4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c87938fc7d99a06a7e5477c45b4e5a4148f85d66"
        }
      ],
      "title": "KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31591",
    "datePublished": "2026-04-24T14:42:18.276Z",
    "dateReserved": "2026-03-09T15:48:24.120Z",
    "dateUpdated": "2026-04-24T14:42:18.276Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-FVVW-8GW5-VW5F

CVE-2026-31591 (GCVE-0-2026-31591)

Tags

Sightings

Nomenclature