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CVE-2026-72318

Estado: RecibidaCrítica (9.4)—

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

cifs: validate DFS referral string offsets

parse_dfs_referrals() validates that the response header and referral array fit in the received buffer, but each referral also contains string offsets supplied by the server.

Those offsets are used to compute the DfsPath and NetworkAddress string pointers without checking whether they still point inside the response buffer. A malformed referral can therefore make the computed pointer exceed the end of the buffer. The resulting negative max_len is then passed to cifs_strndup_from_utf16(), and the non-Unicode path forwards it to kstrndup() as a size_t, allowing strnlen() to read out of bounds.

Leer descripción completaMostrar menos

Validate each string offset before deriving the string pointer.

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N: explotación remota sin autenticación ni interacción. Lectura de memoria fuera de límites (strnlen() y kstrndup() leen más allá del buffer); potencial DoS por corrupción de memoria.

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 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-2026-72318",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.4,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.5,
        "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": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "76c607b9353d377b1d1b11db50e743eee0ccf658",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "d64b6be5740ce230aca184d8d224c75d9866045d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "929a85932d14190988f1eafd6ee8cc68d66ace0b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "b784cd1c24d89bf71be2efe1e948ff7c03371e57",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "c37abc99bb3de3d3219ecef253d649f74117fd83",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "027a84ac6b50c12ef767c15abfc58aa865820e9e",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/client/misc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/client/misc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:04.737",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/027a84ac6b50c12ef767c15abfc58aa865820e9e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/76c607b9353d377b1d1b11db50e743eee0ccf658",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/929a85932d14190988f1eafd6ee8cc68d66ace0b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b784cd1c24d89bf71be2efe1e948ff7c03371e57",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c37abc99bb3de3d3219ecef253d649f74117fd83",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d64b6be5740ce230aca184d8d224c75d9866045d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: validate DFS referral string offsets\n\nparse_dfs_referrals() validates that the response header and referral\narray fit in the received buffer, but each referral also contains string\noffsets supplied by the server.\n\nThose offsets are used to compute the DfsPath and NetworkAddress string\npointers without checking whether they still point inside the response\nbuffer. A malformed referral can therefore make the computed pointer\nexceed the end of the buffer. The resulting negative max_len is then\npassed to cifs_strndup_from_utf16(), and the non-Unicode path forwards it\nto kstrndup() as a size_t, allowing strnlen() to read out of bounds.\n\nValidate each string offset before deriving the string pointer."
    }
  ],
  "lastModified": "2026-08-17T06:18:35.193",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}