Answer in brief
CVE-2026-74509 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.
Answer in brief
CVE-2026-74509 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.