{"id":"CVE-2026-15460","summary":"Missing channel-state validation in Zephyr Bluetooth Classic L2CAP receive path","details":"The Bluetooth Classic (BR/EDR) L2CAP receive handler bt_l2cap_br_recv() in subsys/bluetooth/host/classic/l2cap_br.c dispatched inbound data PDUs based only on the destination channel ID, without checking that the target channel had reached the BT_L2CAP_CONNECTED state. A dynamic channel is assigned its RX CID and added to the connection's channel list while still in BT_L2CAP_CONNECTING (and later BT_L2CAP_CONFIG) — before configuration completes and, for PSMs that require security, before the peer is authenticated (l2cap_br_conn_req()).\n\nBecause the channel is already findable by bt_l2cap_br_lookup_rx_cid() during this window, a remote peer within radio range can send a data PDU addressed to that CID and have it processed on a not-yet-established channel. The dispatch keys off channel fields (BR_CHAN(chan)-\u003erx.mode, rx.mps) that are only initialized during configuration by l2cap_br_conf(); since channel objects are pooled and bt_l2cap_br_chan_del() does not reset rx.mode or the reassembly buffer _sdu, a reused channel can carry stale state into the CONNECTING window and route the frame into the retransmission/flow-control path (bt_l2cap_br_ret_fc_recv()) with stale parameters and a possibly stale _sdu pointer.\n\nThe impact is delivery of attacker data to upper-layer protocol handlers on a half-open (and possibly unauthenticated) channel, plus operation on stale or partially initialized channel state on reused channel objects — leading to channel/link teardown (denial of service) and, in the stale-_sdu case, a dangling-pointer condition. The fix adds an explicit BR_CHAN(chan)-\u003estate \u003c BT_L2CAP_CONNECTED guard that drops any data received before the channel is fully connected.","aliases":["GHSA-hx89-rm6c-hjrh"],"modified":"2026-09-12T08:14:45.508667Z","published":"2026-09-09T22:40:46.492Z","database_specific":{"cna_assigner":"zephyr","cwe_ids":["CWE-666"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15460.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15460.json"},{"type":"ADVISORY","url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hx89-rm6c-hjrh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15460"},{"type":"FIX","url":"https://github.com/zephyrproject-rtos/zephyr/commit/2738ee921ba61ba2e644c95bceba302896dd8c19"},{"type":"PACKAGE","url":"https://github.com/zephyrproject-rtos/zephyr"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zephyrproject-rtos/zephyr","events":[{"introduced":"d4e799d77a36eaf6d678b357c207411ec32b2d62"},{"fixed":"2738ee921ba61ba2e644c95bceba302896dd8c19"}],"database_specific":{"extracted_events":[{"introduced":"1.6.0"},{"fixed":"4.4.2"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15460.json","vanir_signatures_modified":"2026-09-12T08:14:45Z","vanir_signatures":[{"digest":{"line_hashes":["340111244696759058538862922124120006367","249890588737418623400784802500135338373","244400554156868649598552477846084006194","206992370549384359908090413387223235819","190091458938313872596809181808409954318","331929936325811366144137165575903946410","51777626349568179991190531232830534908","159901457272921809180806453628748367419","166384060021663858127356975596965383031","176528040412169084633567558519190296643","205974137729010952417439727402787091166","133195323443098494534218295079646353752","243843565664489700982500364927215873137","176735318537813152582533254324729226523","71041583990564100377424343879471095156","183443541016620398690243800257444707561"],"threshold":0.9},"id":"CVE-2026-15460-08bea07e","signature_type":"Line","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/2738ee921ba61ba2e644c95bceba302896dd8c19","target":{"file":"subsys/bluetooth/host/classic/l2cap_br.c"},"deprecated":false},{"id":"CVE-2026-15460-ad8d954a","signature_type":"Function","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/2738ee921ba61ba2e644c95bceba302896dd8c19","target":{"file":"subsys/bluetooth/host/classic/l2cap_br.c","function":"bt_l2cap_br_recv"},"deprecated":false,"digest":{"function_hash":"241398215919093434181946123974208432134","length":822}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}