« Volver al listado

CVE-2026-90256

Estado: RecibidaAlta (8.8)—

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

Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind

hci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via hci_conn_timeout (disc_work) -> hci_proto_disconn_ind -> l2cap_disconn_ind. This is UAF if the l2cap_conn is deleted concurrently.

disc_work is disabled sync in hci_conn_del(), so we cannot take hci_dev_lock in disc_work.

Fix by using proto_lock to guard l2cap_data, in addition to hdev->lock which is held in other access paths.

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 de UAF en el kernel Linux accesible localmente (AV:A) sin requerir privilegios, en componente de red (Bluetooth L2CAP). El acceso concurrente no sincronizado puede causar denegación de servicio o corrupción de memoria en servicios remotos.

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

Network SegmentationDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork Intrusion 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)

Mostrar
{
  "id": "CVE-2026-90256",
  "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": "ab4eedb790cae44313759b50fe47da285e2519d5",
              "lessThan": "b495a3a9b33bc4e4613e685bf5c96c136caa22d8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ab4eedb790cae44313759b50fe47da285e2519d5",
              "lessThan": "2b66c83ff1751d6bd3201b3017206262ab46dc05",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "efc30877bd4bc85fefe98d80af60fafc86e5775e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f87271d21dd4ee83857ca11b94e7b4952749bbae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "18ab6b6078fa8191ca30a3065d57bf35d5635761",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.6.84",
              "lessThan": "6.7",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.20",
              "lessThan": "6.13",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.13.8",
              "lessThan": "6.14",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:21.980",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind\n\nhci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via\nhci_conn_timeout (disc_work) -> hci_proto_disconn_ind ->\nl2cap_disconn_ind.  This is UAF if the l2cap_conn is deleted\nconcurrently.\n\ndisc_work is disabled sync in hci_conn_del(), so we cannot take\nhci_dev_lock in disc_work.\n\nFix by using proto_lock to guard l2cap_data, in addition to hdev->lock\nwhich is held in other access paths."
    }
  ],
  "lastModified": "2026-09-18T18:17:51.170",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}