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CVE-2026-63812

Estado: Pendiente de análisisAlta (7.8)—

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

f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()

When __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does not reset the length of the largest extent to 0 and update the inode folio. Since modifications to the extent tree are disallowed afterward, the cached largest extent may become stale. This can trigger the following error in xfstests generic/388:

F2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix

In the f2fs_drop_inode path, __destroy_extent_node() does not need to guarantee that et->node_cnt is 0, because concurrency with writeback is expected in this path, and writeback may update the extent cache.

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This patch reverts commit ed78aeebef05 ("f2fs: fix node_cnt race between extent node destroy and writeback"), and remove the unnecessary zero check of et->node_cnt.

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 en kernel Linux (AV:L, PR:L) que afecta gestión de caché de extent; permite corrupción de datos del sistema de ficheros f2fs mediante desincronización de metadatos.

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-2026-63812",
  "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:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "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": "42dd1c91f993431d0b399502479d00e6ad1bca71",
              "lessThan": "7e4d8f98be63f98856a5176b9188dada6e7ba9ee",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ab1eaf9d5c99042f5b0243bf67a06283a4c0757f",
              "lessThan": "58a5deb220bcac4c73bf58954c0845644c997487",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0e4395870eb3441ddc959f6710b5f6ca61aff26",
              "lessThan": "20190e498057997532c7f186d081011f18e0a462",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ed78aeebef05212ef7dca93bd931e4eff67c113f",
              "lessThan": "edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ed78aeebef05212ef7dca93bd931e4eff67c113f",
              "lessThan": "1f70ddb28a3c71df124da5fa4040c808116d6bb9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0559a0e962aacbb47519e26ee663be04b72dcb92",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.6.140",
              "lessThan": "6.6.144",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.88",
              "lessThan": "6.12.95",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.18.30",
              "lessThan": "6.18.38",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "7.0.7",
              "lessThan": "7.1",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/f2fs/extent_cache.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/f2fs/extent_cache.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T12:16:54.137",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1f70ddb28a3c71df124da5fa4040c808116d6bb9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/20190e498057997532c7f186d081011f18e0a462",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/58a5deb220bcac4c73bf58954c0845644c997487",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e4d8f98be63f98856a5176b9188dada6e7ba9ee",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()\n\nWhen __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does\nnot reset the length of the largest extent to 0 and update the inode\nfolio. Since modifications to the extent tree are disallowed afterward,\nthe cached largest extent may become stale. This can trigger the\nfollowing error in xfstests generic/388:\n\nF2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix\n\nIn the f2fs_drop_inode path, __destroy_extent_node() does not need to\nguarantee that et->node_cnt is 0, because concurrency with writeback\nis expected in this path, and writeback may update the extent cache.\n\nThis patch reverts commit ed78aeebef05 (\"f2fs: fix node_cnt race between\nextent node destroy and writeback\"), and remove the unnecessary zero\ncheck of et->node_cnt."
    }
  ],
  "lastModified": "2026-08-17T05:17:18.290",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}