SB20260905168 - Improper Check for Unusual or Exceptional Conditions in Linux kernel fb_set_var() callers in the fbdev framebuffer subsystem
Published: September 5, 2026
Security Bulletin ID
SB20260905168
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) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-80786)
CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause inconsistent framebuffer console state.
The vulnerability exists due to improper state management in fb_set_var() callers when processing display mode changes through sysfs or driver code. A local user can invoke a display mode change to cause inconsistent framebuffer console state.
Remediation
Install update from vendor's website.