PT-2026-52924 · Undefined · Undefined
Publicado
2026-06-26
·
Atualizado
2026-06-26
·
CVE-2026-53285
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In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Wrap DCN32 phantom-plane allocation in DC RUN WITH PREEMPTION ENABLED
[Why]
dcn32 validate bandwidth() wraps dcn32 internal validate bw() with
DC FP START()/DC FP END(). In x86 non-RT, DC FP START takes fpregs lock(),
which disables local softirqs.
The DML1 path through dcn32 enable phantom plane() calls kvzalloc() to
allocate ~335 KiB for dc plane state. This triggers the vmalloc path,
which calls BUG ON(in interrupt()) because it's invoked within the
FPU-enabled (softirq disabled) region, leading to a kernel crash.
[How]
Wrap the dc state create phantom plane() call with the
DC RUN WITH PREEMPTION ENABLED() macro to allow preemption during
this memory allocation.
(cherry picked from commit 885ccbef7b94a8b38f69c4211c679021aa27ad11)
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