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CVE-2026-72186

Estado: RecibidaCrítica (9.1)—

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

ntfs: make system files immutable to prevent corruption

When a system file such as $Bitmap is exposed via show_sys_files and written from userspace, the volume is corrupted and, because the cluster allocator scans $Bitmap through the same inode's page cache, a write to $Bitmap also deadlocks writeback against the folio it already holds locked.

These files are maintained by the driver itself and have no valid reason to be written through the file interface.

Leer descripción completaMostrar menos

Mark base metadata files (mft_no < FILE_first_user) as immutable during inode read so the VFS rejects write, mmap, truncate and unlink with -EPERM. Directories are skipped so the root and $Extend remain usable. Internal metadata updates do not go through the VFS write path and are unaffected.

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.

Exposición de archivos del sistema NTFS mediante show_sys_files permite corrupción de volumen y deadlock; acceso remoto a kernel sin autenticación (AV:N/PR:N) sugiere vector de red explotable como aplicación/servicio expuesto.

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)

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{
  "id": "CVE-2026-72186",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "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": "af0db57d4293cc9fe6ce99fb5592dc2652228c9d",
              "lessThan": "8f313e92522ac41d273ea137db13ea8a8df2beed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "af0db57d4293cc9fe6ce99fb5592dc2652228c9d",
              "lessThan": "f72df3a4c33b64de3418ec74d1ad4f028e09d161",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ntfs/inode.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/inode.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:36.973",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/8f313e92522ac41d273ea137db13ea8a8df2beed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f72df3a4c33b64de3418ec74d1ad4f028e09d161",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: make system files immutable to prevent corruption\n\nWhen a system file such as $Bitmap is exposed via show_sys_files and\nwritten from userspace, the volume is corrupted and, because the cluster\nallocator scans $Bitmap through the same inode's page cache, a write to\n$Bitmap also deadlocks writeback against the folio it already holds locked.\n\nThese files are maintained by the driver itself and have no valid reason\nto be written through the file interface. Mark base metadata files\n(mft_no < FILE_first_user) as immutable during inode read so the VFS\nrejects write, mmap, truncate and unlink with -EPERM. Directories are\nskipped so the root and $Extend remain usable. Internal metadata updates\ndo not go through the VFS write path and are unaffected."
    }
  ],
  "lastModified": "2026-08-17T06:18:19.193",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}