{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1c3506ea8599a3ad1b9aae5cbd573134f8d18db7"
            },
            {
              "fixed": "74768f73854d647a6462f252dc8782ab8a835211"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c"
            },
            {
              "fixed": "7a361c74bb12f3398c388905f1d325be642cd36e"
            },
            {
              "fixed": "67ed191b4c8bdf432a3f32d1eb302880b4795cd1"
            },
            {
              "fixed": "5a1364da2f04217a36e2fdfa2db4ee025b383a20"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.75"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64309.json"
  },
  "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": "CVE-2026-64309",
  "modified": "2026-07-27T03:56:40.813036055Z",
  "published": "2026-07-25T08:49:42.035Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64309.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64309"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)"
}