AZL-48763
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-48763.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-48763
- Upstream
- Published
- 2024-09-04T19:15:30Z
- Modified
- 2026-04-01T05:16:04.857527Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2024-44956 affecting package kernel 6.6.126.1-1
- Details
-
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 preemptfencework_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.
- References