Bug 2357139 (CVE-2025-21995)

Summary: CVE-2025-21995 kernel: drm/sched: Fix fence reference count leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-04-03 08:01:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/sched: Fix fence reference count leak

The last_scheduled fence leaks when an entity is being killed and adding
the cleanup callback fails.

Decrement the reference count of prev when dma_fence_add_callback()
fails, ensuring proper balance.

[phasta: add git tag info for stable kernel]
Comment 1 Avinash Hanwate 2025-04-03 09:25:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040346-CVE-2025-21995-64c3@gregkh/T