Linux Kernel up to 7.0.9 drm /amd/display dcn32_validate_bandwidth locking

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 7.0.9. Affected by this issue is the function dcn32_validate_bandwidth of the file /amd/display of the component drm. Performing a manipulation results in locking. This vulnerability is reported as CVE-2026-53285. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.0.9. It has been classified as critical. This affects the function dcn32_validate_bandwidth of the file /amd/display of the component drm. The manipulation with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on availability. The summary by CVE is:

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)

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-53285 since 06/09/2026. The exploitability is told to be easy. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 323578 (Linux Distros Unpatched Vulnerability : CVE-2026-53285), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 7.0.10 eliminates this vulnerability. Applying the patch 30bb2ec6695d62f63db4aa6179c4626834ed0cd6/183182235f6d53bac62c6c39014738a54a68dfa6 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (323578). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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