Bug 2414721 (CVE-2025-40191)

Summary: CVE-2025-40191 kernel: drm/amdkfd: Fix kfd process ref leaking when userptr unmapping
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-11-12 23:02:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Fix kfd process ref leaking when userptr unmapping

kfd_lookup_process_by_pid hold the kfd process reference to ensure it
doesn't get destroyed while sending the segfault event to user space.

Calling kfd_lookup_process_by_pid as function parameter leaks the kfd
process refcount and miss the NULL pointer check if app process is
already destroyed.
Comment 1 Alexander B 2025-11-13 11:31:23 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111245-CVE-2025-40191-1ea5@gregkh/T