Bug 2401514 (CVE-2023-53552)

Summary: CVE-2023-53552 kernel: drm/i915: mark requests for GuC virtual engines to avoid use-after-free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-04 16:04:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/i915: mark requests for GuC virtual engines to avoid use-after-free

References to i915_requests may be trapped by userspace inside a
sync_file or dmabuf (dma-resv) and held indefinitely across different
proceses. To counter-act the memory leaks, we try to not to keep
references from the request past their completion.
On the other side on fence release we need to know if rq->engine
is valid and points to hw engine (true for non-virtual requests).
To make it possible extra bit has been added to rq->execution_mask,
for marking virtual engines.

(cherry picked from commit 280410677af763f3871b93e794a199cfcf6fb580)
Comment 1 Alexander B 2025-10-06 14:30:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100447-CVE-2023-53552-5ba9@gregkh/T