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CVE-2025-40084

Estado: AplazadaAlta (7.1)—

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

ksmbd: transport_ipc: validate payload size before reading handle

handle_response() dereferences the payload as a 4-byte handle without verifying that the declared payload size is at least 4 bytes. A malformed or truncated message from ksmbd.mountd can lead to a 4-byte read past the declared payload size. Validate the size before dereferencing.

This is a minimal fix to guard the initial handle read.

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.

Vulnerabilidad en ksmbd (acceso local, PR:L, sin interacción) que permite lectura de memoria más allá del buffer declarado; acceso local sin UI:R → T1068; leer 4 bytes no autorizados → T1005 (acceso a datos)

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 ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareData Loss Prevention

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-2025-40084",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "a02e432d5130da4c723aabe1205bac805889fdb2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "2dc125f5da134c0915a840b62565c60a595673dd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "898d527ed94c19980a4d848f10057f1fed578ffb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "867ffd9d67285612da3f0498ca618297f8e41f01",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/server/transport_ipc.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": "6.1.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.115",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/server/transport_ipc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-29T14:15:55.007",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2dc125f5da134c0915a840b62565c60a595673dd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/867ffd9d67285612da3f0498ca618297f8e41f01",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/898d527ed94c19980a4d848f10057f1fed578ffb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a02e432d5130da4c723aabe1205bac805889fdb2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: transport_ipc: validate payload size before reading handle\n\nhandle_response() dereferences the payload as a 4-byte handle without\nverifying that the declared payload size is at least 4 bytes. A malformed\nor truncated message from ksmbd.mountd can lead to a 4-byte read past the\ndeclared payload size. Validate the size before dereferencing.\n\nThis is a minimal fix to guard the initial handle read."
    }
  ],
  "lastModified": "2026-07-30T06:24:10.403",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}