Bug 2420232 (CVE-2023-53806)

Summary: CVE-2023-53806 kernel: drm/amd/display: populate subvp cmd info only for the top pipe
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-09 01:01:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: populate subvp cmd info only for the top pipe

[Why]
System restart observed while changing the display resolution
to 8k with extended mode. Sytem restart was caused by a page fault.

[How]
When the driver populates subvp info it did it for both the pipes using
vblank which caused an outof bounds array access causing the page fault.
added checks to allow the top pipe only to fix this issue.
Comment 1 Alexander B 2025-12-10 08:52:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120943-CVE-2023-53806-03cb@gregkh/T