SB20260905167 - Use-after-free in Linux kernel fbdev core driver
Published: September 5, 2026
Security Bulletin ID
SB20260905167
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-80785)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to store a stale pointer to freed memory in fb_info->mode.
The vulnerability exists due to a use-after-free race condition in the fbdev mode sysfs handlers in drivers/video/fbdev/core/fbsysfs.c when concurrently accessing mode sysfs attributes while the modelist is replaced. A local user can race mode sysfs reads or writes with modelist replacement to store a stale pointer to freed memory in fb_info->mode.
Remediation
Install update from vendor's website.