{"id":"CVE-2026-80692","state":"PUBLISHED","title":"Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks\n\nThere is theoretical UAF if the conn is freed while the hci_sync task\nis running.\n\nHold refcount to avoid that.","publishedAt":"2026-08-28T06:52:55.529Z","updatedAt":"2026-10-21T12:46:52.785Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d948e1ffa1d40240d5c81af6dcbcb87b39cb8d3c","status":"affected","lessThan":"f0a544ef6e38e4063d0ed72ad83d6bf0f4e70805","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"301a4e2e89313dee10f0e8cb084daedbbe4a3dce","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"a4de6fc95b2f36967fc247ae51cad2171194f7cd","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"9a77f296aff4b2ca5f2928ab3a3220c82d8b4074","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"2f5d635ad5906b0235bc0c870e8beba3116e1e98","versionType":"git"},{"version":"5dd0bd277a0a936708a33ecc447dce77a08cbde6","status":"affected","versionType":"git"},{"version":"6.6.51","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.8.9","status":"affected","lessThan":"6.9","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]}],"references":["https://git.kernel.org/stable/c/f0a544ef6e38e4063d0ed72ad83d6bf0f4e70805","https://git.kernel.org/stable/c/301a4e2e89313dee10f0e8cb084daedbbe4a3dce","https://git.kernel.org/stable/c/a4de6fc95b2f36967fc247ae51cad2171194f7cd","https://git.kernel.org/stable/c/9a77f296aff4b2ca5f2928ab3a3220c82d8b4074","https://git.kernel.org/stable/c/2f5d635ad5906b0235bc0c870e8beba3116e1e98"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80692.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80692","state":"PUBLISHED","datePublished":"2026-08-28T06:52:55.529Z","dateUpdated":"2026-10-21T12:46:52.785Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.785Z"},"containers":{"cna":{"title":"Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks\n\nThere is theoretical UAF if the conn is freed while the hci_sync task\nis running.\n\nHold refcount to avoid that."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d948e1ffa1d40240d5c81af6dcbcb87b39cb8d3c","status":"affected","lessThan":"f0a544ef6e38e4063d0ed72ad83d6bf0f4e70805","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"301a4e2e89313dee10f0e8cb084daedbbe4a3dce","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"a4de6fc95b2f36967fc247ae51cad2171194f7cd","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"9a77f296aff4b2ca5f2928ab3a3220c82d8b4074","versionType":"git"},{"version":"881559af5f5c545f6828e7c74d79813eb886d523","status":"affected","lessThan":"2f5d635ad5906b0235bc0c870e8beba3116e1e98","versionType":"git"},{"version":"5dd0bd277a0a936708a33ecc447dce77a08cbde6","status":"affected","versionType":"git"},{"version":"6.6.51","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.8.9","status":"affected","lessThan":"6.9","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f0a544ef6e38e4063d0ed72ad83d6bf0f4e70805"},{"url":"https://git.kernel.org/stable/c/301a4e2e89313dee10f0e8cb084daedbbe4a3dce"},{"url":"https://git.kernel.org/stable/c/a4de6fc95b2f36967fc247ae51cad2171194f7cd"},{"url":"https://git.kernel.org/stable/c/9a77f296aff4b2ca5f2928ab3a3220c82d8b4074"},{"url":"https://git.kernel.org/stable/c/2f5d635ad5906b0235bc0c870e8beba3116e1e98"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - Bluetooth HCI outgoing ACL/LE connection setup (hci_connect_acl_sync/hci_connect_le_sync) is driven by adjacent radio peers supplying HCI events (connection complete/failures, command status) while hci_cmd_sync_work blocks on controller replies on phones and laptops.\nAC:L - Race between hci_cmd_sync_work using a bare hci_conn pointer and hci_conn_del/hci_conn_failed/create_le_conn_complete teardown; attacker controls both sides by concurrently initiating L2CAP/MGMT connects and aborting or inducing remote HCI failure events until the window hits.\nPR:N - Adjacent Bluetooth peers need no Linux credentials; freeing runs on unauthenticated HCI connection events, and local triggering works via unprivileged AF_BLUETOOTH L2CAP connect() without CAP_NET_ADMIN or special namespaces.\nUI:N - Background Bluetooth auto-reconnect, pairing flows, or listening socket-driven outgoing connects create BT_OPEN hci_conn objects without deliberate user action; attacker timing of connect/teardown does not require social engineering.\nS:U - Kernel heap UAF within the Bluetooth stack enables local privilege escalation in the same kernel domain but does not cross VM, IOMMU, or sandbox boundaries.\nC:H - Freed struct hci_conn is dereferenced in hci_acl_create_conn_sync, hci_le_create_conn_sync, and create_le_conn_complete (e.g., conn->pkt_type, conn->dst, conn->le_conn_timeout), enabling slab reuse and arbitrary kernel memory disclosure.\nI:H - Post-free writes occur to conn fields (state, flags, timers) and function-pointer members (cleanup, connect_cfm_cb), providing groomable heap corruption suitable for arbitrary kernel write and code execution.\nA:H - UAF during hci_cmd_sync_work on connection setup reliably causes kernel oops/panic and can be retriggered by repeated connect/abort cycles from adjacent or local attackers."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:46:52.785Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.51","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-80692","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:20:08.082830Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:26:33.571Z"}}]}}}