Vulnerability-Lookup

GHSA-8W5V-46PM-6RG4

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)

Sashiko notes:

if SEV initialization fails and KVM is actively running normal VMs, could a userspace process trigger this code path via /dev/sev ioctls (e.g., SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN execution for an active VM trigger a general protection fault and crash the host?

The SNP_COMMIT command does not require the firmware to be in any particular state. Skip initializing it if it was previously uninitialized.

The SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in Table 5 as a command that is allowed in the UNINIT state, but it is in fact allowed and a future documentation update will reflect that.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64309"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)\n\nSashiko notes:\n\n\u003e if SEV initialization fails and KVM is actively running normal VMs, could a\n\u003e userspace process trigger this code path via /dev/sev ioctls (e.g.,\n\u003e SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN\n\u003e execution for an active VM trigger a general protection fault and crash the\n\u003e host?\n\nThe SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that.",
  "id": "GHSA-8w5v-46pm-6rg4",
  "modified": "2026-07-25T12:31:30Z",
  "published": "2026-07-25T12:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64309"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64309 (GCVE-0-2026-64309)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

Title

crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT) Sashiko notes: > if SEV initialization fails and KVM is actively running normal VMs, could a > userspace process trigger this code path via /dev/sev ioctls (e.g., > SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN > execution for an active VM trigger a general protection fault and crash the > host? The SNP_COMMIT command does not require the firmware to be in any particular state. Skip initializing it if it was previously uninitialized. The SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in Table 5 as a command that is allowed in the UNINIT state, but it is in fact allowed and a future documentation update will reflect that.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/74768f73854d647a6…
https://git.kernel.org/stable/c/7a361c74bb12f3398…
https://git.kernel.org/stable/c/67ed191b4c8bdf432…
https://git.kernel.org/stable/c/5a1364da2f04217a3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 , < 74768f73854d647a6462f252dc8782ab8a835211 (git) Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 7a361c74bb12f3398c388905f1d325be642cd36e (git) Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 67ed191b4c8bdf432a3f32d1eb302880b4795cd1 (git) Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 5a1364da2f04217a36e2fdfa2db4ee025b383a20 (git) Affected: 6.12.75 , < 6.12.96 (semver)
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "74768f73854d647a6462f252dc8782ab8a835211",
              "status": "affected",
              "version": "1c3506ea8599a3ad1b9aae5cbd573134f8d18db7",
              "versionType": "git"
            },
            {
              "lessThan": "7a361c74bb12f3398c388905f1d325be642cd36e",
              "status": "affected",
              "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c",
              "versionType": "git"
            },
            {
              "lessThan": "67ed191b4c8bdf432a3f32d1eb302880b4795cd1",
              "status": "affected",
              "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c",
              "versionType": "git"
            },
            {
              "lessThan": "5a1364da2f04217a36e2fdfa2db4ee025b383a20",
              "status": "affected",
              "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.96",
              "status": "affected",
              "version": "6.12.75",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)\n\nSashiko notes:\n\n\u003e if SEV initialization fails and KVM is actively running normal VMs, could a\n\u003e userspace process trigger this code path via /dev/sev ioctls (e.g.,\n\u003e SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN\n\u003e execution for an active VM trigger a general protection fault and crash the\n\u003e host?\n\nThe SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:49:42.035Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e"
        },
        {
          "url": "https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"
        }
      ],
      "title": "crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64309",
    "datePublished": "2026-07-25T08:49:42.035Z",
    "dateReserved": "2026-07-19T15:36:31.779Z",
    "dateUpdated": "2026-07-25T08:49:42.035Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-8W5V-46PM-6RG4

CVE-2026-64309 (GCVE-0-2026-64309)

Tags

Sightings

Nomenclature