CVE-2024-36944 Reapply "drm/qxl: simplify qxl_fence_wait"
A circular locking dependency in the qxl driver causes a system hang during boot, resulting in 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-2024-36944?
CVE-2024-36944 is a medium-severity vulnerability in Linux kernel, published on 30 May 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:
Reapply "drm/qxl: simplify qxl_fence_wait"
This reverts commit 07ed11afb68d94eadd4ffc082b97c2331307c5ea.
Stephen Rostedt reports: "I went to run my tests on my VMs and the tests hung on boot up. Unfortunately, the most I ever got out was:
[ 93.607888] Testing event system initcall: OK [ 93.667730] Running tests on all trace events: [ 93.669757] Testing all events: OK [ 95.631064] ------------[ cut here ]------------ Timed out after 60 seconds"
and further debugging points to a possible circular locking dependency between the console_owner locking and the worker pool locking.
Reverting the commit allows Steve's VM to boot to completion again.
[ This may obviously result in the "[TTM] Buffer eviction failed" messages again, which was the reason for that original revert. But at this point this seems preferable to a non-booting system... ]
Weakness: CWE-667
Which versions are affected by CVE-2024-36944?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-36944?
Apply the vendor's patch.
Is CVE-2024-36944 being exploited?
There is no known exploitation of CVE-2024-36944 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-36944, DEBIAN-CVE-2024-36944, UBUNTU-CVE-2024-36944.