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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-31

Last Modified

2026-02-03

Generated

2026-07-06

AI Q&A

2026-01-31

EPSS Evaluated

2026-07-05

NVD

CVE-2026-23039

EUVD

EUVD-2026-5055

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

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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