{"id":7504,"date":"2026-09-04T18:49:34","date_gmt":"2026-09-04T10:49:34","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74509"},"modified":"2026-09-04T18:49:34","modified_gmt":"2026-09-04T10:49:34","slug":"cve-2026-74509","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74509","title":{"rendered":"CVE-2026-74509 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync:"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>Bluetooth: hci_sync: Fix advertising data UAFs<\/p>\n<p>hci_find_adv_instance() returns an adv_info pointer that is valid only<br \/>\nwhile hdev-&gt;lock is held.  The advertising command-sync paths perform<br \/>\ninstance lookups without that lock and, in some cases, retain the pointer<br \/>\nwhile waiting for a controller response.<\/p>\n<p>An advertising termination event can therefore interleave as follows:<\/p>\n<p>  hci_cmd_sync_work                 hci_rx_work<br \/>\n  hci_find_adv_instance()<br \/>\n  __hci_cmd_sync_status()<br \/>\n    wait for controller reply       hci_dev_lock()<br \/>\n                                    hci_remove_adv_instance()<br \/>\n                                      kfree(adv)<br \/>\n  adv-&gt;scan_rsp_changed = false<\/p>\n<p>KASAN reported:<\/p>\n<p>  BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1\/0x300<br \/>\n  Write of size 1 at addr ffff88810a45d21d by task kworker\/u17:0\/88<br \/>\n  Workqueue: hci0 hci_cmd_sync_work<br \/>\n  Call Trace:<br \/>\n   hci_set_ext_scan_rsp_data_sync+0x2e1\/0x300<br \/>\n   hci_schedule_adv_instance_sync+0x390\/0x4c0<br \/>\n   hci_cmd_sync_work+0x173\/0x300<br \/>\n  Allocated by task 87:<br \/>\n   hci_add_adv_instance+0x538\/0xac0<br \/>\n   add_advertising+0x885\/0x1160<br \/>\n  Freed by task 89:<br \/>\n   kfree+0x131\/0x3c0<br \/>\n   hci_remove_adv_instance+0x1d8\/0x3b0<br \/>\n   hci_le_ext_adv_term_evt+0x17b\/0x730<\/p>\n<p>Protect the instance lookup and payload construction in the extended<br \/>\nadvertising, scan response, and periodic advertising data paths.  Snapshot<br \/>\nthe advertising parameters under hdev-&gt;lock, but release the lock before<br \/>\nwaiting for the controller.<\/p>\n<p>Clear advertising-data dirty bits before issuing their commands and<br \/>\nrestore them after a failure using a fresh lookup.  Likewise, update the<br \/>\nreported transmit power through a fresh lookup after the parameter command<br \/>\ncompletes.  No adv_info pointer then survives an HCI command wait.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>Bluetooth: hci_sync: Fix advertising data UAFs<\/p>\n<p>hci_find_adv_instance() returns an adv_info pointer that is valid only<br \/>\nwhile hdev-&gt;<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7504","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7504","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}