Bug 2394640 (CVE-2025-39740)

Summary: CVE-2025-39740 kernel: drm/xe/migrate: prevent potential UAF
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-11 17:04:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/xe/migrate: prevent potential UAF

If we hit the error path, the previous fence (if there is one) has
already been put() prior to this, so doing a fence_wait could lead to
UAF. Tweak the flow to do to the put() until after we do the wait.

(cherry picked from commit 9b7ca35ed28fe5fad86e9d9c24ebd1271e4c9c3e)
Comment 1 Jon Moroney 2025-09-11 18:53:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091138-CVE-2025-39740-6b46@gregkh/T