Bug 2420346 (CVE-2023-53864)

Summary: CVE-2023-53864 kernel: drm/mxsfb: Disable overlay plane in mxsfb_plane_overlay_atomic_disable()
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 2025-12-09 02:04:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/mxsfb: Disable overlay plane in mxsfb_plane_overlay_atomic_disable()

When disabling overlay plane in mxsfb_plane_overlay_atomic_update(),
overlay plane's framebuffer pointer is NULL.  So, dereferencing it would
cause a kernel Oops(NULL pointer dereferencing).  Fix the issue by
disabling overlay plane in mxsfb_plane_overlay_atomic_disable() instead.
Comment 1 Alexander B 2025-12-09 18:50:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120906-CVE-2023-53864-8bca@gregkh/T