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CVE-2026-89838

Estado: RecibidaAlta (7.1)—

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

f2fs: limit recovery filename logging to stored length

F2FS stores recovery filenames as a length plus a fixed-size i_name buffer. The buffer is not NUL-terminated, but recover_inode() and recover_dentry() print it with %s.

For a 255-byte filename, recovery logging can read past i_name into the following raw inode fields.

Print the name with a precision bounded by i_namelen and F2FS_NAME_LEN.

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 PR:L permite escalada local; lectura de memoria cruda (inode fields) a través de buffer overflow sin NUL-terminación en logging.

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 ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareData Loss Prevention

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-2026-89838",
  "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:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "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": "f356fe0cba0e3523e538987916bd2acedd4e6f41",
              "lessThan": "7ab1780074943508534343e1e5e5ab0c9ef9dd7b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41",
              "lessThan": "35c5abccd0924b02ad34126f562d93c8d75b0831",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41",
              "lessThan": "317d32e1a8deaf1c01c388badc667334c39e62ca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f356fe0cba0e3523e538987916bd2acedd4e6f41",
              "lessThan": "01027b2fcb74dade59fb833b51023f6593b6a9a2",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/f2fs/recovery.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/f2fs/recovery.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:16:50.620",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/01027b2fcb74dade59fb833b51023f6593b6a9a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/317d32e1a8deaf1c01c388badc667334c39e62ca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/35c5abccd0924b02ad34126f562d93c8d75b0831",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ab1780074943508534343e1e5e5ab0c9ef9dd7b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: limit recovery filename logging to stored length\n\nF2FS stores recovery filenames as a length plus a fixed-size i_name\nbuffer.  The buffer is not NUL-terminated, but recover_inode() and\nrecover_dentry() print it with %s.\n\nFor a 255-byte filename, recovery logging can read past i_name into the\nfollowing raw inode fields.\n\nPrint the name with a precision bounded by i_namelen and F2FS_NAME_LEN."
    }
  ],
  "lastModified": "2026-10-03T11:17:44.310",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}