CVE-2026-10660

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{"affected": [{"affectedData": [{"collectionURL": "https://github.com/zephyrproject-rtos/zephyr", "defaultStatus": "unaffected", "packageName": "zephyr", "product": "zephyr", "programFiles": ["subsys/bluetooth/audio/bap_broadcast_assistant.c"], "vendor": "zephyrproject", "versions": [{"lessThan": "4.3.1", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "4.4.2", "status": "affected", "version": "4.4.0", "versionType": "semver"}]}], "source": "vulnerabilities@zephyrproject.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Bluetooth BAP Broadcast Assistant GATT client in subsys/bluetooth/audio/bap_broadcast_assistant.c reassembled remote Broadcast Receive State data into a single file-static net_buf_simple (att_buf, BT_ATT_MAX_ATTRIBUTE_LEN = 512 bytes) shared by all connection instances, while the BUSY flag, long-read handle, and reset/offset state were per-connection.\n\nWhen the device acts as a Broadcast Assistant connected to multiple Scan Delegator peripherals, notification and long-read callbacks from different connections interleave on the shared buffer: the append in notify_handler (net_buf_simple_add_mem at the not-busy branch) performs no tailroom check, so receive-state notifications from two or more delegators accumulate on the same 512-byte buffer and, with a sufficiently large configured ATT MTU (BT_L2CAP_TX_MTU up to 2000) and two-to-three concurrent connections, write past the buffer into adjacent .bss (net_buf_simple_add only asserts in debug builds).\n\nEven below the overflow threshold, one connection's net_buf_simple_reset zeroes the shared length while another connection's reassembly and GATT read offset are in flight, mixing one peer's data into another's parse. A malicious or compromised Scan Delegator (or two colluding peers) over BLE can trigger this, causing out-of-bounds writes (memory corruption / denial of service) and cross-connection data corruption.\n\nThe fix moves the buffer into the per-connection instance struct so each connection reassembles into its own buffer. Affects Zephyr releases shipping the Broadcast Assistant with the shared buffer, including v4.4.0 and earlier."}, {"lang": "es", "value": "El cliente GATT Bluetooth BAP Broadcast Assistant en subsys/bluetooth/audio/bap_broadcast_assistant.c reensambl\u00f3 datos remotos de Broadcast Receive State en un \u00fanico net_buf_simple est\u00e1tico de archivo (att_buf, BT_ATT_MAX_ATTRIBUTE_LEN = 512 bytes) compartido por todas las instancias de conexi\u00f3n, mientras que el indicador BUSY, el manejador de lectura larga y el estado de reinicio/desplazamiento eran por conexi\u00f3n.\n\nCuando el dispositivo act\u00faa como un Broadcast Assistant conectado a m\u00faltiples perif\u00e9ricos Scan Delegator, las devoluciones de llamada de notificaci\u00f3n y lectura larga de diferentes conexiones se entrelazan en el b\u00fafer compartido: la adici\u00f3n en notify_handler (net_buf_simple_add_mem en la rama no ocupada) no realiza ninguna comprobaci\u00f3n de espacio restante, por lo que las notificaciones de estado de recepci\u00f3n de dos o m\u00e1s delegadores se acumulan en el mismo b\u00fafer de 512 bytes y, con una MTU ATT configurada suficientemente grande (BT_L2CAP_TX_MTU hasta 2000) y de dos a tres conexiones concurrentes, escriben m\u00e1s all\u00e1 del b\u00fafer en el .bss adyacente (net_buf_simple_add solo se afirma en compilaciones de depuraci\u00f3n).\n\nIncluso por debajo del umbral de desbordamiento, el net_buf_simple_reset de una conexi\u00f3n pone a cero la longitud compartida mientras que el reensamblaje y el desplazamiento de lectura GATT de otra conexi\u00f3n est\u00e1n en curso, mezclando los datos de un par en el an\u00e1lisis de otro. Un Scan Delegator malicioso o comprometido (o dos pares en colusi\u00f3n) a trav\u00e9s de BLE puede desencadenar esto, causando escrituras fuera de l\u00edmites (corrupci\u00f3n de memoria / denegaci\u00f3n de servicio) y corrupci\u00f3n de datos entre conexiones.\n\nLa soluci\u00f3n mueve el b\u00fafer a la estructura de instancia por conexi\u00f3n para que cada conexi\u00f3n reensamble en su propio b\u00fafer. Afecta a las versiones de Zephyr que distribuyen el Broadcast Assistant con el b\u00fafer compartido, incluyendo la v4.4.0 y anteriores."}], "id": "CVE-2026-10660", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.7, "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10660", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-13T15:44:09.257224Z", "version": "2.0.3"}}]}, "published": "2026-07-11T17:16:23.920", "references": [{"source": "vulnerabilities@zephyrproject.org", "url": "https://github.com/zephyrproject-rtos/zephyr/commit/0cd61589ff820b6a585c73cb36f1e14b043a2795"}, {"source": "vulnerabilities@zephyrproject.org", "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-73c7-3rh7-v5p9"}], "sourceIdentifier": "vulnerabilities@zephyrproject.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}]}

{}

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