CVE-2024-44956 drm/xe/preempt_fence: enlarge the fence critical section

What is CVE-2024-44956?

CVE-2024-44956 is a medium-severity vulnerability in Linux kernel, published on 4 Sep 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:

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.

Weakness: CWE-667

Which versions are affected by CVE-2024-44956?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-44956?

Apply the vendor's patch.

Is CVE-2024-44956 being exploited?

There is no known exploitation of CVE-2024-44956 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-48763, AZL-48834, BELL-CVE-2024-44956, DEBIAN-CVE-2024-44956, GHSA-q2gx-5vc4-pjjw, UBUNTU-CVE-2024-44956.