In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wrap DCN32...
🔗 CVE IDs covered (1)
📋 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)
🔗 References (6)
- https://nvd.nist.gov/vuln/detail/CVE-2026-53285
- https://git.kernel.org/stable/c/183182235f6d53bac62c6c39014738a54a68dfa6
- https://git.kernel.org/stable/c/30bb2ec6695d62f63db4aa6179c4626834ed0cd6
- https://git.kernel.org/stable/c/a8c1480bb066cf0f6e79129b7292e1c99ff68b9b
- https://git.kernel.org/stable/c/19e82047cb68bcde55791ee20178acd431609b8d
- https://github.com/advisories/GHSA-hwwg-2jmx-c78q