Riskcovery

CVE-2026-53285

drm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED

State
Published
Severity
Not scored
Published
Jun 26, 2026
Updated
Oct 21, 2026
Reserved
Jun 9, 2026

Read the record on cve.org

Description

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)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 235c67634230b0f9ad8c0185272fed36c892b1c4 to before 19e82047cb68bcde55791ee20178acd431609b8dAffected
  • 235c67634230b0f9ad8c0185272fed36c892b1c4 to before a8c1480bb066cf0f6e79129b7292e1c99ff68b9bAffected
  • 235c67634230b0f9ad8c0185272fed36c892b1c4 to before 30bb2ec6695d62f63db4aa6179c4626834ed0cd6Affected
  • 235c67634230b0f9ad8c0185272fed36c892b1c4 to before 183182235f6d53bac62c6c39014738a54a68dfa6Affected
LinuxLinux
  • 6.0Affected
  • before 6.0Not affected
  • 6.12.114 through 6.12.*Not affected
  • 6.18.57 through 6.18.*Not affected
  • 7.0.10 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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