CVE-2026-9263

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Per the Bluetooth specification a start segment (sc=0) always carries a 3-byte time_offset, so its segment-header len must be at least PDU_ISO_SEG_TIMEOFFSET_SIZE (3). isoal_check_seg_header() accepted start segments with len < 3 as valid, and isoal_rx_framed_consume() then computed length = seg_hdr->len - 3 in a uint8_t, underflowing to 253-255 when len is 0-2. That oversized length is passed to isoal_rx_append_to_sdu(), whose copy is clamped only against the destination SDU buffer size, not the source PDU length, so up to ~255 bytes of controller memory beyond the received PDU are copied (via sink_sdu_write_hci()/net_buf_add_mem) into an HCI ISO data packet and delivered to the host. The PDU and its segment headers are entirely attacker-controlled and arrive over the air, reachable through both the CIS and BIS-sync HCI data paths (hci_driver.c) and the vendor data path (ull_iso.c), so a remote CIS peer or a broadcaster the device is synced to can trigger an out-of-bounds read causing information disclosure to the host and potential denial of service (faults or malformed oversized HCI ISO packets). The flaw affects all Zephyr releases since framed ISO reception was introduced in v3.0.0. The fix rejects sc=0 segments with len < 3 in isoal_check_seg_header() and adds a guard before the subtraction in isoal_rx_framed_consume()."}, {"lang": "es", "value": "La capa de adaptaci\u00f3n ISO del controlador Bluetooth de Zephyr (subsys/bluetooth/controller/ll_sw/isoal.c) no valida el campo de longitud de un segmento de inicio PDU ISO enmarcado. Seg\u00fan la especificaci\u00f3n Bluetooth, un segmento de inicio (sc=0) siempre lleva un time_offset de 3 bytes, por lo que la longitud de su encabezado de segmento (len) debe ser al menos PDU_ISO_SEG_TIMEOFFSET_SIZE (3). isoal_check_seg_header() acept\u00f3 segmentos de inicio con len < 3 como v\u00e1lidos, e isoal_rx_framed_consume() luego calcul\u00f3 length = seg_hdr -> len - 3 en un uint8_t, desbord\u00e1ndose por debajo a 253-255 cuando len es 0-2. Esa longitud sobredimensionada se pasa a isoal_rx_append_to_sdu(), cuya copia se limita solo al tama\u00f1o del b\u00fafer SDU de destino, no a la longitud de la PDU de origen, por lo que hasta ~255 bytes de memoria del controlador m\u00e1s all\u00e1 de la PDU recibida se copian (a trav\u00e9s de sink_sdu_write_hci()/net_buf_add_mem) en un paquete de datos ISO HCI y se entregan al host. La PDU y sus encabezados de segmento est\u00e1n completamente controlados por el atacante y llegan por aire, accesibles a trav\u00e9s de las rutas de datos HCI CIS y BIS-sync (hci_driver.c) y la ruta de datos del proveedor (ull_iso.c), por lo que un par CIS remoto o un emisor al que el dispositivo est\u00e1 sincronizado puede desencadenar una lectura fuera de l\u00edmites que cause revelaci\u00f3n de informaci\u00f3n al host y una posible denegaci\u00f3n de servicio (fallos o paquetes ISO HCI sobredimensionados y malformados). La falla afecta a todas las versiones de Zephyr desde que se introdujo la recepci\u00f3n ISO enmarcada en la v3.0.0. La soluci\u00f3n rechaza los segmentos sc=0 con len < 3 en isoal_check_seg_header() y a\u00f1ade una protecci\u00f3n antes de la resta en isoal_rx_framed_consume()."}], "id": "CVE-2026-9263", "lastModified": "2026-10-25T21:10:00.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-9263", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-30T16:40:19.038346Z", "version": "2.0.3"}}]}, "published": "2026-06-30T17:16:26.387", "references": [{"source": "vulnerabilities@zephyrproject.org", "tags": ["Patch"], "url": "https://github.com/zephyrproject-rtos/zephyr/commit/28080d80fc8aca30af1dfd1338bd4481b13c7395"}, {"source": "vulnerabilities@zephyrproject.org", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6gvp-pmh8-fjh2"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6gvp-pmh8-fjh2"}], "sourceIdentifier": "vulnerabilities@zephyrproject.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}]}

{}

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