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CVE-2026-74300

Estado: RecibidaAlta (8.8)—

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

Bluetooth: hci: validate codec capability element length

Read Local Codec Capabilities returns a sequence of capability elements. Each element starts with a one-byte length followed by that many payload bytes.

hci_read_codec_capabilities() checks that the skb contains the length byte, but then validates only caps->len against the remaining skb length. A malformed controller response with one remaining byte and caps->len set to one passes that check even though the element needs two bytes. The parser then records a two-byte capability and copies one byte beyond the advertised response payload into the codec list.

Leer descripción completaMostrar menos

Validate the full element size, including the length byte, before adding it to the accumulated capability length. This preserves all well-formed capability elements and drops only truncated controller responses.

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.

Controlador Bluetooth malformado (AV:A, acceso adyacente) explota validación insuficiente de longitud en kernel; lectura de memoria fuera de límites y posible DoS por corrupción de estado.

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-2026-74300",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/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": 2.8
      }
    ]
  },
  "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": "8961987f3f5fa2f2618e72304d013c8dd5e604a6",
              "lessThan": "fc97fc8cf7f53fd3619db63e09050d20a3a0c4b1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8961987f3f5fa2f2618e72304d013c8dd5e604a6",
              "lessThan": "290b36f9d1eb9b2f72b40d826f26b4a182ab15f7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8961987f3f5fa2f2618e72304d013c8dd5e604a6",
              "lessThan": "f2ad01f55e07f9531efcea736087e6b8658a3440",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8961987f3f5fa2f2618e72304d013c8dd5e604a6",
              "lessThan": "ec4d352747a62c1082f16c11a74b37d6eb85a5a3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8961987f3f5fa2f2618e72304d013c8dd5e604a6",
              "lessThan": "4bc16db0f11918e07edf9fdcda4a30cf4c9df45c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8961987f3f5fa2f2618e72304d013c8dd5e604a6",
              "lessThan": "c38fbcdc407925c7088f7e5f11c1fff73d2d35a2",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/bluetooth/hci_codec.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.16",
              "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": [
            "net/bluetooth/hci_codec.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:29.610",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/290b36f9d1eb9b2f72b40d826f26b4a182ab15f7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4bc16db0f11918e07edf9fdcda4a30cf4c9df45c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c38fbcdc407925c7088f7e5f11c1fff73d2d35a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec4d352747a62c1082f16c11a74b37d6eb85a5a3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f2ad01f55e07f9531efcea736087e6b8658a3440",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fc97fc8cf7f53fd3619db63e09050d20a3a0c4b1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci: validate codec capability element length\n\nRead Local Codec Capabilities returns a sequence of capability elements.\nEach element starts with a one-byte length followed by that many payload\nbytes.\n\nhci_read_codec_capabilities() checks that the skb contains the length\nbyte, but then validates only caps->len against the remaining skb\nlength.  A malformed controller response with one remaining byte and\ncaps->len set to one passes that check even though the element needs two\nbytes.  The parser then records a two-byte capability and copies one\nbyte beyond the advertised response payload into the codec list.\n\nValidate the full element size, including the length byte, before adding\nit to the accumulated capability length.  This preserves all well-formed\ncapability elements and drops only truncated controller responses."
    }
  ],
  "lastModified": "2026-08-17T06:19:24.093",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}