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ReviewHigh

CVE-2026-74509

Linux

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) a...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.15
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

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) a...

Affected product and versions

Product
Linux
Affected versions
>= cba6b758711cab946c787f7c15be92cc749b8e1f < 565971488191bf54a87a417abafab6ad0de72201, >= cba6b758711cab946c787f7c15be92cc749b8e1f < c4cec575a6d6f7c36808a3a0017b0675968bb06b, >= cba6b758711cab946c787f7c15be92cc749b8e1f < 95cdcd8c82a501931fd3ae9b3811b0b6da167e94, >= cba6b758711cab946c787f7c15be92cc749b8e1f < eb1d8318764de7216e6dbba29a24d69f7ce51348, >= cba6b758711cab946c787f7c15be92cc749b8e1f < b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3, >= cba6b758711cab946c787f7c15be92cc749b8e1f < cdc36db204ffd97b947d64374cf23a210dc74777, >= 42fe380baaaccbe635c34ca07b29d19b9ec2498d, >= 5.15.210 < 5.16, >= 5.17
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available