SB2026010749 - Privilege escalation in LightDM KDE Greeter
Published: January 7, 2026
Security Bulletin ID
SB2026010749
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Execution with unnecessary privileges (CVE-ID: CVE-2025-62876)
CWE-ID: CWE-250 - Execution with Unnecessary Privileges
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to application uses the KAuth helper to copy a background image is copied to the service user home directory. A local user can create a symbolic link into its home directory and copy the file to a arbitrary location with root privileges.
Remediation
Install update from vendor's website.