CVE-2026-53285 drm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED
A kernel crash occurs in the AMD display driver when allocating memory for phantom planes while preemption is disabled, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53285?
CVE-2026-53285 is a medium-severity denial of service vulnerability in Linux kernel, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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)
Weakness: CWE-617
Which versions are affected by CVE-2026-53285?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53285?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-53285 being exploited?
There is no known exploitation of CVE-2026-53285 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-91322, BELL-CVE-2026-53285, DEBIAN-CVE-2026-53285, GHSA-hwwg-2jmx-c78q, ROOT-OS-DEBIAN-12-CVE-2026-53285, ROOT-OS-DEBIAN-13-CVE-2026-53285 and 2 more.