CVE-2026-13213

{"id": "CVE-2026-13213", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-13213", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-24T20:10:28.373081Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "vulnerabilities@zephyrproject.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.6}]}, "affected": [{"source": "vulnerabilities@zephyrproject.org", "affectedData": [{"vendor": "zephyrproject", "product": "zephyr", "versions": [{"status": "affected", "version": "3.6.0", "lessThan": "4.4.2", "versionType": "semver"}], "packageName": "zephyr", "programFiles": ["subsys/bluetooth/audio/has.c"], "collectionURL": "https://github.com/zephyrproject-rtos/zephyr", "defaultStatus": "unaffected"}]}], "published": "2026-08-24T18:16:59.450", "references": [{"url": "https://github.com/zephyrproject-rtos/zephyr/commit/cb2329e090755abde8e57cf1c12aa2b9ca41a6a2", "source": "vulnerabilities@zephyrproject.org"}, {"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9rj8-3fvm-cc9f", "source": "vulnerabilities@zephyrproject.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "vulnerabilities@zephyrproject.org", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "The Hearing Access Service (HAS) GATT server in subsys/bluetooth/audio/has.c installs a connection-callback set unconditionally via BT_CONN_CB_DEFINE, so security_changed() runs for every connection that establishes security even before the application has called bt_has_register(). The service attribute pointers hearing_aid_features_attr, preset_control_point_attr, and active_preset_index_attr remain NULL until bt_has_register() resolves them and sets has.registered.\n\nWith CONFIG_BT_SETTINGS, settings_set_cb() restores each bonded client's persisted context at boot and unconditionally sets context->flags to BONDED_CLIENT_INIT_FLAGS (non-zero). When a previously bonded peer reconnects and re-establishes security during the startup window before bt_has_register() has been called, security_changed() sees the non-zero flags and schedules notify_work_handler, which calls bt_gatt_is_subscribed() with a still-NULL attribute pointer. That triggers an assertion (__ASSERT(attr, ...) in bt_gatt_is_subscribed()), or a NULL dereference of attr->uuid when assertions are compiled out.\n\nThe result is a remotely triggerable (Bluetooth, adjacent) crash of the HAS peripheral. Exploitation requires the peer to have previously bonded with the device and to reconnect within the boot-time race window before the application registers the service; a peer that reconnects persistently can prolong the outage. Impact is denial of service only, with no memory corruption or information disclosure.\n\nThe fix adds an early if (!has.registered) { return; } guard in security_changed(), so no notification work is scheduled until the GATT service is registered and its attribute pointers are valid."}, {"lang": "es", "value": "El servidor GATT del Servicio de Acceso Auditivo (HAS) en subsys/bluetooth/audio/has.c instala un conjunto de devoluci\u00f3n de llamada de conexi\u00f3n incondicionalmente a trav\u00e9s de BT_CONN_CB_DEFINE, por lo que security_changed() se ejecuta para cada conexi\u00f3n que establece seguridad incluso antes de que la aplicaci\u00f3n haya llamado a bt_has_register(). Los punteros de atributo del servicio hearing_aid_features_attr, preset_control_point_attr y active_preset_index_attr permanecen NULL hasta que bt_has_register() los resuelve y establece has.registered.\n\nCon CONFIG_BT_SETTINGS, settings_set_cb() restaura el contexto persistente de cada cliente vinculado al arrancar y establece incondicionalmente context -> flags a BONDED_CLIENT_INIT_FLAGS (no cero). Cuando un par previamente vinculado se reconecta y restablece la seguridad durante la ventana de inicio antes de que se haya llamado a bt_has_register(), security_changed() ve los indicadores no cero y programa notify_work_handler, que llama a bt_gatt_is_subscribed() con un puntero de atributo a\u00fan NULL. Eso activa una aserci\u00f3n (__ASSERT(attr, ...) en bt_gatt_is_subscribed()), o una desreferencia NULL de attr -> uuid cuando las aserciones se compilan fuera.\n\nEl resultado es un fallo (Bluetooth, adyacente) del perif\u00e9rico HAS que puede ser activado remotamente. La explotaci\u00f3n requiere que el par se haya vinculado previamente con el dispositivo y que se reconecte dentro de la ventana de carrera de tiempo de arranque antes de que la aplicaci\u00f3n registre el servicio; un par que se reconecta persistentemente puede prolongar la interrupci\u00f3n. El impacto es solo denegaci\u00f3n de servicio, sin corrupci\u00f3n de memoria ni revelaci\u00f3n de informaci\u00f3n.\n\nLa soluci\u00f3n a\u00f1ade una protecci\u00f3n temprana if (!has.registered) { return; } en security_changed(), por lo que no se programa ning\u00fan trabajo de notificaci\u00f3n hasta que el servicio GATT est\u00e9 registrado y sus punteros de atributo sean v\u00e1lidos."}], "lastModified": "2026-10-12T15:10:00.207", "sourceIdentifier": "vulnerabilities@zephyrproject.org"}