Bug 2435658 (CVE-2026-23039) - CVE-2026-23039 kernel: drm/gud: fix NULL fb and crtc dereferences on USB disconnect
Summary: CVE-2026-23039 kernel: drm/gud: fix NULL fb and crtc dereferences on USB disc...
Keywords:
Status: NEW
Alias: CVE-2026-23039
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-31 12:02 UTC by OSIDB Bzimport
Modified: 2026-02-11 01:02 UTC (History)
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Description OSIDB Bzimport 2026-01-31 12:02:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/gud: fix NULL fb and crtc dereferences on USB disconnect

On disconnect drm_atomic_helper_disable_all() is called which
sets both the fb and crtc for a plane to NULL before invoking a commit.

This causes a kernel oops on every display disconnect.

Add guards for those dereferences.
Comment 1 Alexander B 2026-02-02 09:54:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026013122-CVE-2026-23039-be18@gregkh/T
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