CVE-2026-23039
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-31

Last updated on: 2026-02-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/gud: fix NULL fb and crtc dereferences on USB disconnect On disconnect drm_atomic_helper_disable_all() is called which sets both the fb and crtc for a plane to NULL before invoking a commit. This causes a kernel oops on every display disconnect. Add guards for those dereferences.
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Meta Information
Published
2026-01-31
Last Modified
2026-02-03
Generated
2026-06-16
AI Q&A
2026-01-31
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23039
EUVD
EUVD-2026-5055
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability occurs in the Linux kernel's drm/gud component, where on USB display disconnect, the system calls drm_atomic_helper_disable_all() which sets framebuffer (fb) and CRT controller (crtc) pointers to NULL before committing changes. However, the code did not properly guard against dereferencing these NULL pointers, causing a kernel oops (crash) on every display disconnect. The fix adds checks to prevent dereferencing NULL fb and crtc pointers.

Impact Analysis

This vulnerability can cause the Linux kernel to crash (kernel oops) whenever a USB display is disconnected. This can lead to system instability, potential data loss, and disruption of services relying on the display subsystem.

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