Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/xe/preempt_fence: enlarge the fence critical section It is really easy to introduce subtle deadlocks in preempt_fence_work_func() since we operate on single global ordered-wq for signalling our preempt fences behind the scenes, so even though we signal a particular fence, everything in the callback should be in the fence critical section, since blocking in the callback will prevent other published fences from signalling. If we enlarge the fence critical section to cover the entire callback, then lockdep should be able to understand this better, and complain if we grab a sensitive lock like vm->lock, which is also held when waiting on preempt fences.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 6.10.5 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/3cd1585e57908b6efcd967465ef7685f40b2a294Patch
- https://git.kernel.org/stable/c/458bb83119dfee5d14c677f7846dd9363817006fPatch
FAQ
What is CVE-2024-44956?
CVE-2024-44956 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: drm/xe/preempt_fence: enlarge the fence critical section It is really easy to introduce subtle deadlocks in preempt_fence_work_fun...
How severe is CVE-2024-44956?
CVE-2024-44956 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-44956?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.