SB2026072109 - Use-after-free in Linux kernel fbdev core driver

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Main Vulnerability Database SB2026072109

SB2026072109 - Use-after-free in Linux kernel fbdev core driver

Published: July 21, 2026

Security Bulletin ID SB2026072109
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) Use-after-free (CVE-ID: CVE-2026-63826)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in store_modes() and related framebuffer mode handling in fbdev when processing crafted framebuffer mode changes through ioctl or sysfs interfaces. A local user can trigger stale mode pointer dereferences to cause a denial of service.

The issue involves stale pointers in fb_display[i].mode and fb_info->mode after the framebuffer modelist is replaced and the old list is freed.


Remediation

Install update from vendor's website.

References