CVE-2026-64308

{
  "id": "CVE-2026-64308",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-25T10:17:11.917",
  "lastModified": "2026-10-24T13:10:00.147",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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> if SEV initialization fails and KVM is actively running normal VMs, could a\n> userspace process trigger this code path via /dev/sev ioctls (e.g.,\n> SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN\n> execution for an active VM trigger a general protection fault and crash the\n> host?\n\nThe SEV firmware docs for SNP_VLEK_LOAD note:\n\n> 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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ccp - No inicializar SNP para ioctl(SNP_VLEK_LOAD)\n\nSashiko señala:\n\n> si la inicialización de SEV falla y KVM está ejecutando activamente máquinas virtuales normales, ¿podría un\n> proceso de espacio de usuario activar esta ruta de código a través de ioctls de /dev/sev (por ejemplo,\n> SEV_PDH_GEN) y poner a cero MSR_VM_HSAVE_PA globalmente? ¿La siguiente ejecución de VMRUN\n> para una máquina virtual activa activaría una falla de protección general y bloquearía el\n> anfitrión?\n\nLa documentación del firmware de SEV para SNP_VLEK_LOAD señala:\n\n> En SNP_SHUTDOWN, el VLEK es eliminado.\n\nEs decir, el envoltorio de inicialización/apagado aquí es inútil, porque el\nfirmware desecha inmediatamente la clave de todos modos. En su lugar, negarse a hacer\nnada si SNP no ha sido inicializado previamente.\n\nEsto es una ruptura de ABI: antes, esto era una operación nula y casi con certeza un\nerror del espacio de usuario, y ahora devuelve -ENODEV. La compatibilidad ABI podría ser\nmantenida aquí simplemente devolviendo 0 en la verificación en su lugar."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "1c3506ea8599a3ad1b9aae5cbd573134f8d18db7",
              "lessThan": "61cf5eef20657bff9ca235fe938a99ce5ff65c06",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c",
              "lessThan": "92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c",
              "lessThan": "8836801847b9479ac046cb18a24981e1b0b05e9d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c",
              "lessThan": "f91e9dbb5845d1e5abf1028e6df57dcf61583e1b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.12.75",
              "lessThan": "6.12.96",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.16",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.96",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.39",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.4",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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  "references": [
    {
      "url": "https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "url": "https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d",
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}