Bug 2365260 (CVE-2025-37870)

Summary: CVE-2025-37870 kernel: drm/amd/display: prevent hang on link training fail
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-09 07:02:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: prevent hang on link training fail

[Why]
When link training fails, the phy clock will be disabled. However, in
enable_streams, it is assumed that link training succeeded and the
mux selects the phy clock, causing a hang when a register write is made.

[How]
When enable_stream is hit, check if link training failed. If it did, fall
back to the ref clock to avoid a hang and keep the system in a recoverable
state.
Comment 1 Michal Findra 2025-05-09 08:36:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050959-CVE-2025-37870-311a@gregkh/T