CVE-2024-41063 Bluetooth: hci_core: cancel all works upon hci_unregister_dev()
A race condition in the Linux kernel Bluetooth subsystem can cause a deadlock during device unregistration, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-41063?
CVE-2024-41063 is a medium-severity vulnerability in Linux kernel, published on 29 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_core: cancel all works upon hci_unregister_dev()
syzbot is reporting that calling hci_release_dev() from hci_error_reset() due to hci_dev_put() from hci_error_reset() can cause deadlock at destroy_workqueue(), for hci_error_reset() is called from hdev->req_workqueue which destroy_workqueue() needs to flush.
We need to make sure that hdev->{rx_work,cmd_work,tx_work} which are queued into hdev->workqueue and hdev->{power_on,error_reset} which are queued into hdev->req_workqueue are no longer running by the moment
destroy_workqueue(hdev->workqueue); destroy_workqueue(hdev->req_workqueue);
are called from hci_release_dev().
Call cancel_work_sync() on these work items from hci_unregister_dev() as soon as hdev->list is removed from hci_dev_list.
Weakness: CWE-667
Which versions are affected by CVE-2024-41063?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-41063?
Apply the vendor's patch.
Is CVE-2024-41063 being exploited?
There is no known exploitation of CVE-2024-41063 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-41063, DEBIAN-CVE-2024-41063, GHSA-2ff5-8rvr-hgx3, UBUNTU-CVE-2024-41063.