CVE-2025-40318
Published Dec 8, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once hci_cmd_sync_dequeue_once() does lookup and then cancel the entry under two separate lock sections. Meanwhile, hci_cmd_sync_work() can also delete the same entry, leading to double list_del() and "UAF". Fix this by holding cmd_sync_work_lock across both lookup and cancel, so that the entry cannot be removed concurrently.
Is your site exposed to CVE-2025-40318?
Run a free security scan — no signup, results in seconds.
References
Other References
https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772
https://git.kernel.org/stable/c/0a94f7e017438935c09ef833a1aa908ad9875213
https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389
https://git.kernel.org/stable/c/9cd536970192b72257afcdfba0bfc09993e6f19c
https://git.kernel.org/stable/c/ae76cf6c2c842944c6514c57df54d728f1916553
Frequently Asked Questions
What is CVE-2025-40318? +
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
hci_cmd_sync_dequeue_once() does lookup and then cancel
the entry under two separate lock sections. Meanwhile,
hci_cmd_sync_work() can also delete the same entry,
leading to double list_del() and "UAF".
Fix this by holding cmd_sync_work_lock across both
lookup and cancel, so that the entry cannot be removed
concurrently.
How do I check if I'm vulnerable to CVE-2025-40318? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.