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CVE-2026-80663

Estado: RecibidaAlta (7.1)—

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

tools/power/x86/intel-speed-select: Harden daemon pidfile open

Avoid symlink-based pidfile clobbering by opening the pidfile with O_NOFOLLOW and validating it with fstat() before locking/writing.

The daemon currently uses a fixed pidfile path under /tmp. A local unprivileged user can pre-create a symlink at that path and cause a root-run daemon instance to write into an attacker-chosen file.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad local (AV:L, PR:L) en daemon root: symlink en /tmp permite a usuario no privilegiado modificar ficheros como root (T1068), afectando integridad de datos y disponibilidad del servicio.

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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

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

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-80663",
  "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:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "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": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "lessThan": "905493a6338c82a70da16f86e0a6215db5a3d73d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "lessThan": "db938eb9a3c1317596c28e94413b33426508d51b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "lessThan": "72a07abc6b9046f07a08bba353cad7667bcc9dce",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "lessThan": "19ffeb30fdfce63f8d6aca71bcdddb3f69d46278",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "lessThan": "e8adac69d1bdf035ef97cc914e845acd4ef08e28",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "lessThan": "607af438e6430893a822964c841a1994b33acccc",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "tools/power/x86/intel-speed-select/isst-daemon.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "tools/power/x86/intel-speed-select/isst-daemon.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-28T08:16:51.503",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/72a07abc6b9046f07a08bba353cad7667bcc9dce",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/905493a6338c82a70da16f86e0a6215db5a3d73d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/db938eb9a3c1317596c28e94413b33426508d51b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntools/power/x86/intel-speed-select: Harden daemon pidfile open\n\nAvoid symlink-based pidfile clobbering by opening the pidfile with\nO_NOFOLLOW and validating it with fstat() before locking/writing.\n\nThe daemon currently uses a fixed pidfile path under /tmp. A local\nunprivileged user can pre-create a symlink at that path and cause a\nroot-run daemon instance to write into an attacker-chosen file."
    }
  ],
  "lastModified": "2026-08-29T07:16:48.797",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}