CVE-2025-68313

Estado: AplazadaAlta (7.1)—

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

x86/CPU/AMD: Add RDSEED fix for Zen5

There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail.

Add a fix glue which checks microcode revisions.

Detalles técnicos trazas, registros y código del informe original

  [ bp: Add microcode revisions checking, rewrite. ]

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.14%
Percentil entre todas las CVEs puntuadas: 3
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation65 %
Impacto principalT1552 Unsecured Credentialscredential access45 %

Vulnerabilidad local (AV:L/PR:L) en generador RDSEED de Zen5 que retorna valores predecibles; permite lectura de datos aleatorios comprometidos (C:H). No hay impacto de integridad ejecutable claro.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Update Software Active Directory Configuration User Training Threat Intelligence Program Restrict File and Directory Permissions Privileged Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-68313",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
              "lessThan": "e980de2ff109dacb6d9d3a77f01b27c467115ecb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
              "lessThan": "36ff93e66d0efc46e39fab536a9feec968daa766",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
              "lessThan": "607b9fb2ce248cc5b633c5949e0153838992c152",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5953e7a89966fc5a42124a08ba33a9c57ba5173c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.6.156",
              "lessThan": "6.7",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "arch/x86/kernel/cpu/amd.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/x86/kernel/cpu/amd.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-16T16:16:10.883",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere's an issue with RDSEED's 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n  [ bp: Add microcode revisions checking, rewrite. ]"
    }
  ],
  "lastModified": "2026-09-02T13:17:01.690",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}