Bug 2451166 (CVE-2026-23350)

Summary: CVE-2026-23350 kernel: drm/xe/queue: Call fini on exec queue creation fail
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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A flaw was found in the Linux kernel. When an execution queue fails to initialize in the `drm/xe/queue` component, the system does not properly finalize it, leaving a damaged entry in a critical lookup list. This can lead to an invalid memory reference, potentially causing system instability or a denial of service (DoS).
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Description OSIDB Bzimport 2026-03-25 11:02:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/xe/queue: Call fini on exec queue creation fail

Every call to queue init should have a corresponding fini call.
Skipping this would mean skipping removal of the queue from GuC list
(which is part of guc_id allocation). A damaged queue stored in
exec_queue_lookup list would lead to invalid memory reference,
sooner or later.

Call fini to free guc_id. This must be done before any internal
LRCs are freed.

Since the finalization with this extra call became very similar to
__xe_exec_queue_fini(), reuse that. To make this reuse possible,
alter xe_lrc_put() so it can survive NULL parameters, like other
similar functions.

v2: Reuse _xe_exec_queue_fini(). Make xe_lrc_put() aware of NULLs.

(cherry picked from commit 393e5fea6f7d7054abc2c3d97a4cfe8306cd6079)
Comment 1 Alexander B 2026-03-25 18:42:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026032536-CVE-2026-23350-f4be@gregkh/T