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CVE-2025-40198

Estado: AplazadaAlta (7.8)—

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

ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()

Unlike other strings in the ext4 superblock, we rely on tune2fs to make sure s_mount_opts is NUL terminated. Harden parse_apply_sb_mount_options() by treating s_mount_opts as a potential __nonstring.

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.

AV:L y UI:R sugieren ejecución en cliente (abrir archivo kernel malformado); buffer over-read en parse_apply_sb_mount_options() podría permitir ejecución de código en el contexto del kernel.

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

Restrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or Program

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-2025-40198",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "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": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "7bf46ff83a0ef11836e38ebd72cdc5107209342d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "b2bac84fde28fb6a88817b8b761abda17a1d300b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "e651294218d2684302ee5ed95ccf381646f3e5b4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "01829af7656b56d83682b3491265d583d502e502",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "2a0cf438320cdb783e0378570744c0ef0d83e934",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "a6e94557cd05adc82fae0400f6e17745563e5412",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b67f04ab9de5d8f3a71aef72bf02c995a506db5",
              "lessThan": "8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.36"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.36",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.114",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-11-12T22:15:46.923",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/01829af7656b56d83682b3491265d583d502e502",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2a0cf438320cdb783e0378570744c0ef0d83e934",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7bf46ff83a0ef11836e38ebd72cdc5107209342d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a6e94557cd05adc82fae0400f6e17745563e5412",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b2bac84fde28fb6a88817b8b761abda17a1d300b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e651294218d2684302ee5ed95ccf381646f3e5b4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid potential buffer over-read in parse_apply_sb_mount_options()\n\nUnlike other strings in the ext4 superblock, we rely on tune2fs to\nmake sure s_mount_opts is NUL terminated.  Harden\nparse_apply_sb_mount_options() by treating s_mount_opts as a potential\n__nonstring."
    }
  ],
  "lastModified": "2026-07-30T06:24:17.010",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}