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CVE-2026-80721

Estado: RecibidaAlta (8.8)—

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

Bluetooth: ISO: ensure no dangling hcon references in iso_conn

After iso_conn_del(), ISO sockets should not dereference the hcon any more. Currently, clearing iso_conn::hcon relies on iso_conn_del() releasing the last reference to the iso_conn.

Simplify this by explicitly clearing conn->hcon in iso_conn_del(), to avoid more complex reasoning on races about who holds the last reference.

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 PR sugiere T1210. La referencia colgante en ISO Bluetooth puede causar DoS o escalada; confianza moderada por descripción técnica sin detalles explotables explícitos.

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 ProgramApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability ScanningPrivileged Account Management

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-2026-80721",
  "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": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
              "lessThan": "e941799c31f68e67ce0976efb38a79101f921b64",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
              "lessThan": "cdce8af9291d8a1f8916c271de029bf558d9e8ec",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
              "lessThan": "aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f53e7489273dc2bb307bf50f319b3762d45534f0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a58d0f5dac322e16cc75334d000666512341bde5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.11.11",
              "lessThan": "6.12",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.2",
              "lessThan": "6.13",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-28T08:16:57.903",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cdce8af9291d8a1f8916c271de029bf558d9e8ec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e941799c31f68e67ce0976efb38a79101f921b64",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: ensure no dangling hcon references in iso_conn\n\nAfter iso_conn_del(), ISO sockets should not dereference the hcon any\nmore.  Currently, clearing iso_conn::hcon relies on iso_conn_del()\nreleasing the last reference to the iso_conn.\n\nSimplify this by explicitly clearing conn->hcon in iso_conn_del(), to\navoid more complex reasoning on races about who holds the last\nreference."
    }
  ],
  "lastModified": "2026-08-30T07:17:21.673",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}