{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1c3506ea8599a3ad1b9aae5cbd573134f8d18db7"
            },
            {
              "fixed": "61cf5eef20657bff9ca235fe938a99ce5ff65c06"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c"
            },
            {
              "fixed": "92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4"
            },
            {
              "fixed": "8836801847b9479ac046cb18a24981e1b0b05e9d"
            },
            {
              "fixed": "f91e9dbb5845d1e5abf1028e6df57dcf61583e1b"
            }
          ],
          "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-2026-64308.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)\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 SEV firmware docs for SNP_VLEK_LOAD note:\n\n\u003e On SNP_SHUTDOWN, the VLEK is deleted.\n\nThat is, the initialization/shutdown wrapper here is pointless, because the\nfirmware immediately throws away the key anyway. Instead, refuse to do\nanything if SNP has not been previously initialized.\n\nThis is an ABI break: before, this was a no-op and almost certainly a\nmistake by userspace, and now it returns -ENODEV. ABI compatibility could be\nmaintained here by simply returning 0 in the check instead.",
  "id": "CVE-2026-64308",
  "modified": "2026-09-06T03:30:53.158378273Z",
  "published": "2026-07-25T08:49:41.411Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64308.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64308"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)"
}