CVE-2026-10680

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Because multiple signaling commands can be packed into one PDU, buf->len may exceed a command's len. An attacker can send a CONF_REQ command with a header length smaller than the configuration-request structure (e.g. 0), followed by another command so that buf->len still satisfies the check. The check then passes incorrectly and opt_len = len - sizeof(*req) underflows the uint16_t to a near-0xFFFF value. The configuration-option loop, which lacks an opt_len-versus-buf->len guard, then walks far past the end of the pooled ACL receive buffer using net_buf pull primitives that perform no runtime bounds check, producing an out-of-bounds read of host memory and, when the out-of-bounds option bytes encode an MTU or flush-timeout option, an out-of-bounds write. The BR/EDR signaling channel is processed before pairing/encryption and an L2CAP channel to an L0 service such as SDP can be opened without pairing, so an unauthenticated peer within radio range that can establish an ACL connection can trigger the flaw, leading to memory corruption and denial of service (host/device crash). The defect is present in released versions including v4.4.0. The fix validates against len instead of buf->len in both handlers."}, {"lang": "es", "value": "Los manejadores de se\u00f1alizaci\u00f3n L2CAP Classic (BR/EDR) l2cap_br_conf_req() y l2cap_br_conf_rsp() en subsys/bluetooth/host/classic/l2cap_br.c validaron el tama\u00f1o m\u00ednimo del comando contra buf -> len (los bytes restantes en la PDU recibida completa) en lugar de len (la longitud de datos por comando del encabezado de se\u00f1alizaci\u00f3n L2CAP). Debido a que m\u00faltiples comandos de se\u00f1alizaci\u00f3n pueden empaquetarse en una PDU, buf -> len puede exceder la longitud de un comando. Un atacante puede enviar un comando CONF_REQ con una longitud de encabezado menor que la estructura de solicitud de configuraci\u00f3n (por ejemplo, 0), seguido de otro comando para que buf -> len a\u00fan satisfaga la verificaci\u00f3n. La verificaci\u00f3n entonces pasa incorrectamente y opt_len = len - sizeof(req) provoca un desbordamiento negativo del uint16_t a un valor cercano a 0xFFFF. El bucle de opciones de configuraci\u00f3n, que carece de una protecci\u00f3n opt_len-versus-buf -> len, entonces avanza mucho m\u00e1s all\u00e1 del final del b\u00fafer de recepci\u00f3n ACL agrupado utilizando primitivas de extracci\u00f3n net_buf que no realizan ninguna verificaci\u00f3n de l\u00edmites en tiempo de ejecuci\u00f3n, produciendo una lectura fuera de l\u00edmites de la memoria del host y, cuando los bytes de opci\u00f3n fuera de l\u00edmites codifican una opci\u00f3n MTU o de tiempo de espera de vaciado, una escritura fuera de l\u00edmites. El canal de se\u00f1alizaci\u00f3n BR/EDR se procesa antes del emparejamiento/cifrado y un canal L2CAP a un servicio L0 como SDP puede abrirse sin emparejamiento, por lo que un par no autenticado dentro del alcance de la radio que pueda establecer una conexi\u00f3n ACL puede activar la falla, lo que lleva a corrupci\u00f3n de memoria y denegaci\u00f3n de servicio (bloqueo del host/dispositivo). El defecto est\u00e1 presente en versiones lanzadas, incluida la v4.4.0. La soluci\u00f3n valida contra len en lugar de buf -> len en ambos manejadores."}], "id": "CVE-2026-10680", "lastModified": "2026-10-24T19:10:00.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.7, "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10680", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-22T19:33:04.837486Z", "version": "2.0.3"}}]}, "published": "2026-07-21T22:17:00.303", "references": [{"source": "vulnerabilities@zephyrproject.org", "tags": ["Patch"], "url": "https://github.com/zephyrproject-rtos/zephyr/commit/1d451683377f4c8e56d7718565bea7b5c1155159"}, {"source": "vulnerabilities@zephyrproject.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-vrwx-p97q-8854"}], "sourceIdentifier": "vulnerabilities@zephyrproject.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}]}

{}

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