Answer in brief
CVE-2026-74509 records a High severity (CVSS 8.8) vulnerability in Bluetooth: hci_sync: Fix advertising data UAFs. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cba6b758711cab946c787f7c15be92cc749b8e1f <95cdcd8c82a501931fd3ae9b3811b0b6da167e94 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <eb1d8318764de7216e6dbba29a24d69f7ce51348 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <cdc36db204ffd97b947d64374cf23a210dc74777 || 42fe380baaaccbe635c34ca07b29d19b9ec2498d || >=5.15.210 <5.16 | 95cdcd8c82a501931fd3ae9b3811b0b6da167e94, eb1d8318764de7216e6dbba29a24d69f7ce51348, b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3, cdc36db204ffd97b947d64374cf23a210dc74777, 5.16 |
| Linux/Linuxgeneric | 5.17 | Not reported |
| Linux/Linuxgeneric | >=cba6b758711cab946c787f7c15be92cc749b8e1f <565971488191bf54a87a417abafab6ad0de72201 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <95cdcd8c82a501931fd3ae9b3811b0b6da167e94 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <eb1d8318764de7216e6dbba29a24d69f7ce51348 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <cdc36db204ffd97b947d64374cf23a210dc74777 || 42fe380baaaccbe635c34ca07b29d19b9ec2498d || >=5.15.210 <5.16 | 565971488191bf54a87a417abafab6ad0de72201, 95cdcd8c82a501931fd3ae9b3811b0b6da167e94, eb1d8318764de7216e6dbba29a24d69f7ce51348, b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3, cdc36db204ffd97b947d64374cf23a210dc74777, 5.16 |
| Linux/Linuxgeneric | >=cba6b758711cab946c787f7c15be92cc749b8e1f <565971488191bf54a87a417abafab6ad0de72201 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <c4cec575a6d6f7c36808a3a0017b0675968bb06b || >=cba6b758711cab946c787f7c15be92cc749b8e1f <95cdcd8c82a501931fd3ae9b3811b0b6da167e94 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <eb1d8318764de7216e6dbba29a24d69f7ce51348 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3 || >=cba6b758711cab946c787f7c15be92cc749b8e1f <cdc36db204ffd97b947d64374cf23a210dc74777 || 42fe380baaaccbe635c34ca07b29d19b9ec2498d || >=5.15.210 <5.16 | 565971488191bf54a87a417abafab6ad0de72201, c4cec575a6d6f7c36808a3a0017b0675968bb06b, 95cdcd8c82a501931fd3ae9b3811b0b6da167e94, eb1d8318764de7216e6dbba29a24d69f7ce51348, b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3, cdc36db204ffd97b947d64374cf23a210dc74777, 5.16 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix advertising data UAFs hci_find_adv_instance() returns an adv_info pointer that is valid only while hdev->lock is held. The advertising command-sync paths perform instance lookups without that lock and, in some cases, retain the pointer while waiting for a controller response. An advertising termination event can therefore interleave as follows: hci_cmd_sync_work hci_rx_work hci_find_adv_instance() __hci_cmd_sync_status() wait for controller reply hci_dev_lock() hci_remove_adv_instance() kfree(adv) adv->scan_rsp_changed = false KASAN reported: BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300 Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88 Workqueue: hci0 hci_cmd_sync_work Call Trace: hci_set_ext_scan_rsp_data_sync+0x2e1/0x300 hci_schedule_adv_instance_sync+0x390/0x4c0 hci_cmd_sync_work+0x173/0x300 Allocated by task 87: hci_add_adv_instance+0x538/0xac0 add_advertising+0x885/0x1160 Freed by task 89: kfree+0x131/0x3c0 hci_remove_adv_instance+0x1d8/0x3b0 hci_le_ext_adv_term_evt+0x17b/0x730 Protect the instance lookup and payload construction in the extended advertising, scan response, and periodic advertising data paths. Snapshot the advertising parameters under hdev->lock, but release the lock before waiting for the controller. Clear advertising-data dirty bits before issuing their commands and restore them after a failure using a fresh lookup. Likewise, update the reported transmit power through a fresh lookup after the parameter command completes. No adv_info pointer then survives an HCI command wait.
Quoted source text, attributed separately from HOL analysis.