The vulnerability occurs in the Linux kernel's drm/amd/display component where the function dcn32_enable_phantom_plane() calls kvzalloc() to allocate approximately 335 KiB for dc_plane_state within a region where local softirqs are disabled due to the fpregs_lock() taken by DC_FP_START(). This violates the kernel's expectation that vmalloc should not be called in interrupt context, causing a BUG_ON(in_interrupt()) and resulting in a kernel crash (denial of service). The fix involves wrapping the dc_state_create_phantom_plane() call with DC_RUN_WITH_PREEMPTION_ENABLED() to allow preemption during memory allocation, preventing the crash.

The vulnerability leads to a denial of service via a kernel crash when the phantom-plane allocation is triggered under the affected conditions. There is no impact on confidentiality or integrity. The crash occurs due to a kernel BUG_ON triggered by improper memory allocation context.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The fix involves applying the commit that wraps the phantom-plane allocation with DC_RUN_WITH_PREEMPTION_ENABLED() to enable preemption during the allocation. Until patched, avoid triggering the affected code path if possible.