SB2026081529 - NULL pointer dereference in Linux kernel fbdev core driver

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Main Vulnerability Database SB2026081529

SB2026081529 - NULL pointer dereference in Linux kernel fbdev core driver

Published: August 15, 2026

Security Bulletin ID SB2026081529
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-74424)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in fbcon_new_modelist() and related fbcon console handling in drivers/video/fbdev/core/fbcon.c when processing framebuffer modelist changes for a console without vc_data. A local user can trigger a modelist change on such a console to cause a denial of service.

The issue occurs when fb_display[i].mode remains set after the associated console data has been freed.


Remediation

Install update from vendor's website.

References