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CVE-2025-40068

Estado: AplazadaAlta (8.4)—

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

fs: ntfs3: Fix integer overflow in run_unpack()

The MFT record relative to the file being opened contains its runlist, an array containing information about the file's location on the physical disk. Analysis of all Call Stack paths showed that the values of the runlist array, from which LCNs are calculated, are not validated before run_unpack function.

The run_unpack function decodes the compressed runlist data format from MFT attributes (for example, $DATA), converting them into a runs_tree structure, which describes the mapping of virtual clusters (VCN) to logical clusters (LCN).

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The NTFS3 subsystem also has a shortcut for deleting files from MFT records - in this case, the RUN_DEALLOCATE command is sent to the run_unpack input, and the function logic provides that all data transferred to the runlist about file or directory is deleted without creating a runs_tree structure.

Substituting the runlist in the $DATA attribute of the MFT record for an arbitrary file can lead either to access to arbitrary data on the disk bypassing access checks to them (since the inode access check occurs above) or to destruction of arbitrary data on the disk.

Add overflow check for addition operation.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

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 sin UI:R → T1068. Integer overflow permite acceso a datos arbitrarios (T1005) o destrucción de datos (T1565.001) manipulando runlist en atributo $DATA del 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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageExecution PreventionEncrypt Sensitive InformationApplication 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 KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-40068",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.4,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/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": 2.5
      }
    ]
  },
  "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": [
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              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "f6b36cfd25cbadad63447c673743cf771090e756",
              "versionType": "git"
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            },
            {
              "status": "affected",
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              "lessThan": "a86c8b9d03f7101e1750233846fe989df6f0d631",
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              "lessThan": "736fc7bf5f68f6b74a0925b7e072c571838657d2",
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          ],
          "programFiles": [
            "fs/ntfs3/run.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.195",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.156",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "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/run.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-28T12:15:41.277",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3ac37e100385b59ac821a62118494442238aaac4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/5aa5799d162ad1b8e8b699d48b6218143c695a78",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/736fc7bf5f68f6b74a0925b7e072c571838657d2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/9378cfe228c2c679564a4116bcb28c8e89dff989",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a86c8b9d03f7101e1750233846fe989df6f0d631",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/f6b36cfd25cbadad63447c673743cf771090e756",
      "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: Fix integer overflow in run_unpack()\n\nThe MFT record relative to the file being opened contains its runlist,\nan array containing information about the file's location on the physical\ndisk. Analysis of all Call Stack paths showed that the values of the\nrunlist array, from which LCNs are calculated, are not validated before\nrun_unpack function.\n\nThe run_unpack function decodes the compressed runlist data format\nfrom MFT attributes (for example, $DATA), converting them into a runs_tree\nstructure, which describes the mapping of virtual clusters (VCN) to\nlogical clusters (LCN). The NTFS3 subsystem also has a shortcut for\ndeleting files from MFT records - in this case, the RUN_DEALLOCATE\ncommand is sent to the run_unpack input, and the function logic\nprovides that all data transferred to the runlist about file or\ndirectory is deleted without creating a runs_tree structure.\n\nSubstituting the runlist in the $DATA attribute of the MFT record for an\narbitrary file can lead either to access to arbitrary data on the disk\nbypassing access checks to them (since the inode access check\noccurs above) or to destruction of arbitrary data on the disk.\n\nAdd overflow check for addition operation.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
    }
  ],
  "lastModified": "2026-07-30T06:24:09.537",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}