CVE-2026-53285 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability. Although the vulnerability has been resolved, it is essential for developers and maintainers to review the patch and ensure that it is applied correctly. Linux distribution vendors should update their kernel packages to include the fix. Users of Linux-based systems should ensure that their systems are updated with the latest kernel packages.

Technical summary

The vulnerability is caused by a conflict between FPU-enabled regions and memory allocation in the drm/amd/display module. Specifically, dcn32_validate_bandwidth() wraps dcn32_internal_validate_bw() with DC_FP_START()/DC_FP_END(), which disables local softirqs on x86 non-RT systems. When the DML1 path through dcn32_enable_phantom_plane() calls kvzalloc() to allocate memory, it triggers the vmalloc path, which calls BUG_ON(in_interrupt()) and results in a kernel crash. The fix involves wrapping the dc_state_create_phantom_plane() call with the DC_RUN_WITH_PREEMPTION_ENABLED() macro to allow preemption during memory allocation.

Defensive priority

High priority should be given to applying the patch to resolve this vulnerability. Linux kernel developers and maintainers should review the patch and ensure that it is applied correctly. Linux distribution vendors should update their kernel packages to include the fix.

Recommended defensive actions

• Review the patch and ensure that it is applied correctly to the Linux kernel.
• Update Linux kernel packages to include the fix.
• Verify that the DC_RUN_WITH_PREEMPTION_ENABLED() macro is correctly implemented and applied.
• Monitor systems for any potential issues related to this vulnerability.
• Perform regular kernel updates to ensure that the latest security patches are applied.

Evidence notes

The vulnerability was introduced due to a conflict between FPU-enabled regions and memory allocation. The fix involves wrapping the dc_state_create_phantom_plane() call with the DC_RUN_WITH_PREEMPTION_ENABLED() macro. The vulnerability has been resolved, and the patch has been applied to the Linux kernel. However, it is essential to review the patch and ensure that it is applied correctly.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.