CVE-2026-53285

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)

Score

CVSS 3.1 5.5 Medium

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-06-26

Last modified

2026-10-21

Weaknesses

CWE-617

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/19e82047cb68bcde55791ee20178acd431609b8d
• https://git.kernel.org/stable/c/a8c1480bb066cf0f6e79129b7292e1c99ff68b9b
• https://git.kernel.org/stable/c/30bb2ec6695d62f63db4aa6179c4626834ed0cd6
• https://git.kernel.org/stable/c/183182235f6d53bac62c6c39014738a54a68dfa6