{"id":"CVE-2026-74509","revision":"84d13544f0a844f8adb0058208be314a","records":[{"revision":"84d13544f0a844f8adb0058208be314a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74509","aliases":[],"title":"Bluetooth: hci_sync: Fix advertising data UAFs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix advertising data UAFs\n\nhci_find_adv_instance() returns an adv_info pointer that is valid only\nwhile hdev->lock is held. The advertising command-sync paths perform\ninstance lookups without that lock and, in some cases, retain the pointer\nwhile waiting for a controller response.\n\nAn advertising termination event can therefore interleave as follows:\n\n hci_cmd_sync_work hci_rx_work\n hci_find_adv_instance()\n __hci_cmd_sync_status()\n wait for controller reply hci_dev_lock()\n hci_remove_adv_instance()\n kfree(adv)\n adv->scan_rsp_changed = false\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\n Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88\n Workqueue: hci0 hci_cmd_sync_work\n Call Trace:\n hci_set_ext_scan_rsp_data_sync+0x2e1/0x300\n hci_schedule_adv_instance_sync+0x390/0x4c0\n hci_cmd_sync_work+0x173/0x300\n Allocated by task 87:\n hci_add_adv_instance+0x538/0xac0\n add_advertising+0x885/0x1160\n Freed by task 89:\n kfree+0x131/0x3c0\n hci_remove_adv_instance+0x1d8/0x3b0\n hci_le_ext_adv_term_evt+0x17b/0x730\n\nProtect the instance lookup and payload construction in the extended\nadvertising, scan response, and periodic advertising data paths. Snapshot\nthe advertising parameters under hdev->lock, but release the lock before\nwaiting for the controller.\n\nClear advertising-data dirty bits before issuing their commands and\nrestore them after a failure using a fresh lookup. Likewise, update the\nreported transmit power through a fresh lookup after the parameter command\ncompletes. No adv_info pointer then survives an HCI command wait.","state":0,"publishedAt":"2026-08-15T12:27:31.896+00:00","modifiedAt":"2026-10-16T19:05:51.377+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bluetooth/hci_sync.c\"\n ],\n \"versions\": [\n {\n \"version\": \"cba6b758711cab946c787f7c15be92cc749b8e1f\",\n \"lessThan\": \"565971488191bf54a87a417abafab6ad0de72201\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cba6b758711cab946c787f7c15be92cc749b8e1f\",\n \"lessThan\": \"c4cec575a6d6f7c36808a3a0017b0675968bb06b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cba6b758711cab946c787f7c15be92cc749b8e1f\",\n \"lessThan\": \"95cdcd8c82a501931fd3ae9b3811b0b6da167e94\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cba6b758711cab946c787f7c15be92cc749b8e1f\",\n \"lessThan\": \"eb1d8318764de7216e6dbba29a24d69f7ce51348\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cba6b758711cab946c787f7c15be92cc749b8e1f\",\n \"lessThan\": \"b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cba6b758711cab946c787f7c15be92cc749b8e1f\",\n \"lessThan\": \"cdc36db204ffd97b947d64374cf23a210dc74777\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42fe380baaaccbe635c34ca07b29d19b9ec2498d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThan\": \"5.16\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bluetooth/hci_sync.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.17\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.17\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.184\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.154\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.103\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.44\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.8\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/565971488191bf54a87a417abafab6ad0de72201","https://git.kernel.org/stable/c/c4cec575a6d6f7c36808a3a0017b0675968bb06b","https://git.kernel.org/stable/c/95cdcd8c82a501931fd3ae9b3811b0b6da167e94","https://git.kernel.org/stable/c/eb1d8318764de7216e6dbba29a24d69f7ce51348","https://git.kernel.org/stable/c/b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3","https://git.kernel.org/stable/c/cdc36db204ffd97b947d64374cf23a210dc74777"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74509","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74509","identifiers":["CVE-2026-74509"]},"retained":false,"historicalAffected":[]}],"coverage":[]}