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CVE-2025-40067

Estado: AplazadaAlta (7.8)—

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

fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist

Index allocation requires at least one bit in the $BITMAP attribute to track usage of index entries. If the bitmap is empty while index blocks are already present, this reflects on-disk corruption.

syzbot triggered this condition using a malformed NTFS image. During a rename() operation involving a long filename (which spans multiple index entries), the empty bitmap allowed the name to be added without valid tracking. Subsequent deletion of the original entry failed with -ENOENT, due to unexpected index state.

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Reject such cases by verifying that the bitmap is not empty when index blocks exist.

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.

Requiere interacción del usuario (UI:R) mediante imagen NTFS malformada; la corrupción de índices causa DoS y manipulación de datos del filesystem.

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

Restrict File and Directory PermissionsRemote Data StorageFilter Network TrafficEncrypt Sensitive InformationApplication Isolation and SandboxingExploit Protection

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-2025-40067",
  "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:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "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": "b35a50d639ca5259466ef5fea85529bb4fb17d5b",
              "lessThan": "978aac54e93ea35aab20b32ae393d3d33964e7ae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3ed2cc6a6e93fbeb8c0cafce1e7fb1f64a331dcc",
              "lessThan": "be66551da203862c689c12e1d35ce87217c017c1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d99208b91933fd2a58ed9ed321af07dacd06ddc3",
              "lessThan": "039ddf353cc33f6546a87ec1ac3210637d714bec",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d99208b91933fd2a58ed9ed321af07dacd06ddc3",
              "lessThan": "0dc7117da8f92dd5fe077d712a756eccbe377d40",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "358d4f821c03add421a4c49290538a705852ccf1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a285395020780adac1ffbc844069c3d700bf007a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.6.102",
              "lessThan": "6.6.112",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.42",
              "lessThan": "6.12.53",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.15.10",
              "lessThan": "6.16",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.16.1",
              "lessThan": "6.17",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/ntfs3/index.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/ntfs3/index.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-28T12:15:41.167",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/039ddf353cc33f6546a87ec1ac3210637d714bec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0dc7117da8f92dd5fe077d712a756eccbe377d40",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/978aac54e93ea35aab20b32ae393d3d33964e7ae",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/be66551da203862c689c12e1d35ce87217c017c1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist\n\nIndex allocation requires at least one bit in the $BITMAP attribute to\ntrack usage of index entries. If the bitmap is empty while index blocks\nare already present, this reflects on-disk corruption.\n\nsyzbot triggered this condition using a malformed NTFS image. During a\nrename() operation involving a long filename (which spans multiple\nindex entries), the empty bitmap allowed the name to be added without\nvalid tracking. Subsequent deletion of the original entry failed with\n-ENOENT, due to unexpected index state.\n\nReject such cases by verifying that the bitmap is not empty when index\nblocks exist."
    }
  ],
  "lastModified": "2026-07-30T06:24:09.427",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}