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CVE-2026-89611

Estado: RecibidaCrítica (9.8)—

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

ntfs: validate non-resident attribute offsets

ntfs_attr_update_meta() shifts the attribute name when converting between non-sparse and sparse attributes. Converting to sparse also adds the compressed_size field before the name and mapping pairs, requiring eight additional bytes in the attribute record.

However, the validator does not check that name_offset is within safe boundaries for these operations or that the additional space is available. A malicious MFT record could set name_offset such that:

Add validation to ensure: - For named attributes, name_offset is within valid bounds - Name does not extend beyond the attribute or overlap with mapping pairs - For non-sparse, non-compressed attributes, eight bytes are available after mapping_pairs_offset for the compressed_size field

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The space check also covers unnamed attributes, for which name_offset = 0 is valid and no name range needs to be checked.

Detalles técnicos trazas, registros y código del informe original
1. The name is positioned at the very end of a non-sparse attribute.
   Converting to sparse would shift the name forward by 8 bytes,
   writing beyond the attribute boundary.

2. The name overlaps with the mapping pairs, causing corruption during
   conversion.

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.

CVE crítico en kernel Linux (AV:N, sin autenticación). Escritura de memoria más allá de límites en conversión de atributos NTFS permite corrupción de datos o DoS. Explotación remota de aplicación expuesta (servidor que procesa MFT).

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

Filter Network TrafficVulnerability ScanningRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork Segmentation

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)

Mostrar
{
  "id": "CVE-2026-89611",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "cd7b3dc7557faadeea626034e3bac68a449851ef",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "lessThan": "a83e82b0ec3ae523028e24813f23f18b43e8fc1c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "7.2.4",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/ntfs/attrib.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/ntfs/attrib.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:46.203",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cd7b3dc7557faadeea626034e3bac68a449851ef",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: validate non-resident attribute offsets\n\nntfs_attr_update_meta() shifts the attribute name when converting between\nnon-sparse and sparse attributes. Converting to sparse also adds the\ncompressed_size field before the name and mapping pairs, requiring eight\nadditional bytes in the attribute record.\n\nHowever, the validator does not check that name_offset is within safe\nboundaries for these operations or that the additional space is available.\nA malicious MFT record could set name_offset such that:\n\n1. The name is positioned at the very end of a non-sparse attribute.\n   Converting to sparse would shift the name forward by 8 bytes,\n   writing beyond the attribute boundary.\n\n2. The name overlaps with the mapping pairs, causing corruption during\n   conversion.\n\nAdd validation to ensure:\n- For named attributes, name_offset is within valid bounds\n- Name does not extend beyond the attribute or overlap with mapping pairs\n- For non-sparse, non-compressed attributes, eight bytes are available\n  after mapping_pairs_offset for the compressed_size field\n\nThe space check also covers unnamed attributes, for which name_offset = 0\nis valid and no name range needs to be checked."
    }
  ],
  "lastModified": "2026-09-13T07:17:26.617",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}