CVE-2026-53285 is a vulnerability in Linux Kernel
Published on June 26, 2026
drm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED
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)
Products Associated with CVE-2026-53285
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Affected Versions
Linux:- Version 235c67634230b0f9ad8c0185272fed36c892b1c4 and below 30bb2ec6695d62f63db4aa6179c4626834ed0cd6 is affected.
- Version 235c67634230b0f9ad8c0185272fed36c892b1c4 and below 183182235f6d53bac62c6c39014738a54a68dfa6 is affected.
- Version 6.0 is affected.
- Before 6.0 is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.