{"id":"CVE-2026-10675","summary":"Bluetooth Mesh PB-ADV: invalidated provisioning link kept alive indefinitely, blocking (re)provisioning (DoS)","details":"In Zephyr's Bluetooth Mesh PB-ADV provisioning bearer (subsys/bluetooth/mesh/pb_adv.c), prov_msg_recv() rescheduled the provisioning protocol watchdog timer unconditionally at the top of the function, before the FCS check and before the ADV_LINK_INVALID check. Once a provisioning attempt fails, prov_failed() sets ADV_LINK_INVALID and the only recovery path is the protocol timer firing (protocol_timeout -\u003e prov_link_close -\u003e close_link -\u003e reset_adv_link and re-enabling of scanning and the unprovisioned device beacon).\n\nA remote, unauthenticated attacker on the BLE advertising channel can first induce a provisioning failure (e.g. with a malformed generic-provisioning PDU) and then transmit any FCS-valid PB-ADV transaction PDU on the same link ID more often than once per protocol timeout (60 s, or 120 s for OOB input/output). Because each such packet reset the timer even on an invalidated link, protocol_timeout never fired, the dead link was never torn down, and the device remained pinned in an un-provisionable state with its unprovisioned beacon disabled and new Link Open requests rejected.\n\nPB-ADV PDUs are processed without authentication and the FCS is a keyless CRC, so no pairing or prior trust is required and the attacker chooses the link ID itself. The impact is a persistent denial of provisioning/re-provisioning service; there is no memory-safety, confidentiality, or integrity impact.\n\nThe vulnerable code shipped in releases through v4.4.1. The fix moves the timer reschedule to after the ADV_LINK_INVALID check (and the FCS check before the reset) so an invalidated link can no longer be kept alive by incoming packets.","aliases":["GHSA-4rwg-6mr4-55hc"],"modified":"2026-11-05T08:04:07.530694623Z","published":"2026-07-21T21:30:54.165Z","database_specific":{"cna_assigner":"zephyr","cwe_ids":["CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10675.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10675.json"},{"type":"ADVISORY","url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4rwg-6mr4-55hc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10675"},{"type":"FIX","url":"https://github.com/zephyrproject-rtos/zephyr/commit/3f3c37edf80262b838ef5402fec9880c07892e4e"},{"type":"PACKAGE","url":"https://github.com/zephyrproject-rtos/zephyr"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zephyrproject-rtos/zephyr","events":[{"introduced":"a6eef0ba3755f2530c5ce93524e5ac4f5be30194"},{"fixed":"75f67d766726351b30199f9a2bf55803d717a3be"},{"introduced":"684c9e8f32e4373a21098559f748f06915f950c9"},{"fixed":"dccb09599635bdff17633fa7e9dab014b91dce90"},{"fixed":"3f3c37edf80262b838ef5402fec9880c07892e4e"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"3.5.0"},{"fixed":"4.3.1"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"strategy":"StandardRange","range":[{"introduced":"4.4.0"},{"fixed":"4.4.2"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"3f3c37edf80262b838ef5402fec9880c07892e4e"}]}]}}],"versions":["v4.4.2-rc1","v4.3.1-rc1","v4.4.1","v4.4.1-rc1","v4.4.0","v4.3.0","v4.3.0-rc3","v4.3.0-rc2","v4.3.0-rc1","v4.2.0","v4.2.0-rc3","v4.2.0-rc2","v4.2.0-rc1","v4.1.0","v4.1.0-rc3","v4.1.0-rc2","v4.1.0-rc1","v4.0.0","v4.0.0-rc3","v4.0.0-rc2","v4.0.0-rc1","v3.7.0","v3.7.0-rc3","v3.7.0-rc2","v3.7.0-rc1","v3.6.0","v3.6.0-rc3","v3.6.0-rc2","v3.6.0-rc1","zephyr-v3.5.0","v3.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10675.json","vanir_signatures":[{"target":{"file":"subsys/bluetooth/mesh/pb_adv.c"},"deprecated":false,"digest":{"line_hashes":["36990507507999401083225437851575074985","96086450392260678739589445710095477841","205108787430650180067298231255490486765","179820365406700740487350131703223013283","261012202192235918073129574240203554744","27228043570620708014343221748776268568","9943409473035023655965619514287775621"],"threshold":0.9},"id":"CVE-2026-10675-8587e982","signature_type":"Line","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/3f3c37edf80262b838ef5402fec9880c07892e4e"},{"deprecated":false,"digest":{"function_hash":"175785866220103837990551053915551205991","length":481},"id":"CVE-2026-10675-9c44afb6","signature_type":"Function","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/3f3c37edf80262b838ef5402fec9880c07892e4e","target":{"file":"subsys/bluetooth/mesh/pb_adv.c","function":"prov_msg_recv"}}],"vanir_signatures_modified":"2026-11-05T08:04:07Z"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}