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CVE-2025-68799

Estado: AplazadaAlta (8.1)—

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

caif: fix integer underflow in cffrml_receive()

The cffrml_receive() function extracts a length field from the packet header and, when FCS is disabled, subtracts 2 from this length without validating that len >= 2.

If an attacker sends a malicious packet with a length field of 0 or 1 to an interface with FCS disabled, the subtraction causes an integer underflow.

This can lead to memory exhaustion and kernel instability, potential information disclosure if padding contains uninitialized kernel memory.

Fix this by validating that len >= 2 before performing the subtraction.

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:A (red adyacente) sin privilegios → T1210. Integer underflow causa agotamiento de memoria (DoS) e informac. disclosure; validación faltante en cffrml_receive() lo sustenta.

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

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

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-2025-68799",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "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": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "c54091eec6fed19e94182aa05dd6846600a642f7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "785c7be6361630070790f6235b696da156ac71b3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "f818cd472565f8b0c2c409b040e0121c5cf8592c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "21fdcc00656a60af3c7aae2dea8dd96abd35519c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "lessThan": "8a11ff0948b5ad09b71896b7ccc850625f9878d1",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/caif/cffrml.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.35"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.35",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/caif/cffrml.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-01-13T16:16:01.907",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/21fdcc00656a60af3c7aae2dea8dd96abd35519c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/785c7be6361630070790f6235b696da156ac71b3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8a11ff0948b5ad09b71896b7ccc850625f9878d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c54091eec6fed19e94182aa05dd6846600a642f7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f818cd472565f8b0c2c409b040e0121c5cf8592c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncaif: fix integer underflow in cffrml_receive()\n\nThe cffrml_receive() function extracts a length field from the packet\nheader and, when FCS is disabled, subtracts 2 from this length without\nvalidating that len >= 2.\n\nIf an attacker sends a malicious packet with a length field of 0 or 1\nto an interface with FCS disabled, the subtraction causes an integer\nunderflow.\n\nThis can lead to memory exhaustion and kernel instability, potential\ninformation disclosure if padding contains uninitialized kernel memory.\n\nFix this by validating that len >= 2 before performing the subtraction."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncaif: corrige desbordamiento negativo de enteros en cffrml_receive()\n\nLa función cffrml_receive() extrae un campo de longitud del encabezado del paquete y, cuando FCS está deshabilitado, resta 2 a esta longitud sin validar que len >= 2.\n\nSi un atacante envía un paquete malicioso con un campo de longitud de 0 o 1 a una interfaz con FCS deshabilitado, la resta causa un desbordamiento negativo de enteros.\n\nEsto puede llevar a agotamiento de memoria e inestabilidad del kernel, potencial revelación de información si el relleno contiene memoria del kernel no inicializada.\n\nSoluciona esto validando que len >= 2 antes de realizar la resta."
    }
  ],
  "lastModified": "2026-07-30T06:24:45.387",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}