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CVE-2026-72202

Estado: RecibidaAlta (7.5)—

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

ntfs: avoid heap allocation for free-cluster readahead state

get_nr_free_clusters() allocates a temporary file_ra_state before it publishes the precomputed free cluster count, sets NVolFreeClusterKnown(), and wakes vol->free_waitq. If that allocation fails, the worker returns without setting the flag or waking waiters, so callers waiting for the free count can block indefinitely.

The readahead state is only used synchronously while scanning the bitmap. Keep it on the stack and pass it by address to the readahead helper.

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This eliminates the early allocation failure path instead of adding a special case that publishes a conservative count and wakes the waitqueue. Zero-initialize the on-stack state because file_ra_state_init() only sets ra_pages and prev_pos.

Apply the same treatment to __get_nr_free_mft_records(), which scans the MFT bitmap with the same short-lived readahead state.

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.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication 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-2026-72202",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "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": "6251f0b0de7d645e3591931ca4c11d8322c1866f",
              "lessThan": "40ee64e633e5e413f2255bb48c063977d8c86f34",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6251f0b0de7d645e3591931ca4c11d8322c1866f",
              "lessThan": "c05132077df57a384919f61d7f8a8e76d748a6d4",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ntfs/super.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/super.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:38.860",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/40ee64e633e5e413f2255bb48c063977d8c86f34",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c05132077df57a384919f61d7f8a8e76d748a6d4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: avoid heap allocation for free-cluster readahead state\n\nget_nr_free_clusters() allocates a temporary file_ra_state before it\npublishes the precomputed free cluster count, sets NVolFreeClusterKnown(),\nand wakes vol->free_waitq. If that allocation fails, the worker returns\nwithout setting the flag or waking waiters, so callers waiting for the free\ncount can block indefinitely.\n\nThe readahead state is only used synchronously while scanning the bitmap.\nKeep it on the stack and pass it by address to the readahead helper. This\neliminates the early allocation failure path instead of adding a special\ncase that publishes a conservative count and wakes the waitqueue.\nZero-initialize the on-stack state because file_ra_state_init() only sets\nra_pages and prev_pos.\n\nApply the same treatment to __get_nr_free_mft_records(), which scans the\nMFT bitmap with the same short-lived readahead state."
    }
  ],
  "lastModified": "2026-08-18T07:16:53.560",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}