Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: use hdev->workqueue when queuing hdev->{cmd,ncmd}_timer works
syzbot is reporting attempt to schedule hdev->cmd_work work from system_wq WQ into hdev->workqueue WQ which is under draining operation [1], for commit c8efcc2589464ac7 ("workqueue: allow chained queueing during destruction") does not allow such operation.
The check introduced by commit 877afadad2dce8aa ("Bluetooth: When HCI work queue is drained, only queue chained work") was incomplete.
Use hdev->workqueue WQ when queuing hdev->{cmd,ncmd}_timer works because hci_{cmd,ncmd}_timeout() calls queue_work(hdev->workqueue). Also, protect the queuing operation with RCU read lock in order to avoid calling queue_delayed_work() after cancel_delayed_work() completed.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 3b382555706558f5c0587862b6dc03e96a252bba, < c4635cf3d845a7324c25c52d549b70c8bd7ad4c7; >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e, < 3c6b036fe5c8ed8b6c4cbdc03605929882907ef0; >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e, < deee93d13d385103205879a8a0915036ecd83261; 4bf367fa1fefabdf14938d0ac9ed60020389112e; >= 5.19.2, < 5.19.15; >= 5.18.18, < 5.19 |
| Linux | Linux | 6.0 |
References
Timeline
- Published
- Dec 30, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Deferred