CVE-2026-72199

Estado: RecibidaCrítica (9.8)—

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

ntfs: validate resident index root values on lookup

Resident $INDEX_ROOT values carry index header fields that callers consume after lookup. Some callers already validate parts of the layout before walking entries, but those checks are scattered and do not cover all root header invariants, such as entries_offset alignment and lower bound, index_length, and allocated_size consistency.

The resident root resize paths now keep these header fields consistent while the value size changes: ntfs_ir_truncate() lowers index.allocated_size before shrinking the resident value, and ntfs_ir_reparent() grows the resident value before publishing a larger root header.

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Lookup-time validation can therefore cover these invariants without tripping over the driver's own resize paths.

Add $INDEX_ROOT to the minimum resident value size table and validate the resident index header fields before returning the attribute from lookup. Require 8-byte aligned index header fields, a sane entries_offset, an index_length within allocated_size, allocated_size within the resident value, and enough entry space for at least an index entry header.

The shared validator already rejects non-resident records for resident-only attribute types, including $INDEX_ROOT.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.55%
Percentil entre todas las CVEs puntuadas: 44
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %

Vulnerabilidad remota (AV:N/AC:L/PR:N) en núcleo Linux que valida estructuras de índice NTFS; explotación remota sin autenticación. Los impactos derivan de corrupción de memoria no validada (ejecución arbitraria o escalada).

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

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Tecnologías afectadas (1)

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

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-72199",
  "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": "0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0",
              "lessThan": "bfb01dd319b6b4c3e79756de7b75ccf0b9a0a247",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0",
              "lessThan": "fcf5bf0e8570798970e3ae8c95d04765ba2c5b97",
              "versionType": "git"
            }
          ],
          "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": "affected",
              "version": "7.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/ntfs/attrib.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:38.533",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/bfb01dd319b6b4c3e79756de7b75ccf0b9a0a247",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fcf5bf0e8570798970e3ae8c95d04765ba2c5b97",
      "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 resident index root values on lookup\n\nResident $INDEX_ROOT values carry index header fields that callers\nconsume after lookup. Some callers already validate parts of the layout\nbefore walking entries, but those checks are scattered and do not cover\nall root header invariants, such as entries_offset alignment and lower\nbound, index_length, and allocated_size consistency.\n\nThe resident root resize paths now keep these header fields consistent\nwhile the value size changes: ntfs_ir_truncate() lowers\nindex.allocated_size before shrinking the resident value, and\nntfs_ir_reparent() grows the resident value before publishing a larger\nroot header. Lookup-time validation can therefore cover these invariants\nwithout tripping over the driver's own resize paths.\n\nAdd $INDEX_ROOT to the minimum resident value size table and validate the\nresident index header fields before returning the attribute from lookup.\nRequire 8-byte aligned index header fields, a sane entries_offset, an\nindex_length within allocated_size, allocated_size within the resident\nvalue, and enough entry space for at least an index entry header.\n\nThe shared validator already rejects non-resident records for\nresident-only attribute types, including $INDEX_ROOT."
    }
  ],
  "lastModified": "2026-08-18T07:16:53.240",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}