Numeric Truncation Error in X.org Server - CVE-2026-93518
Published: October 20, 2026
Vulnerability identifier: #VU156265
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2026-93518
CWE-ID: CWE-197
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to numeric truncation error within the handling of XkbSetMap requests, which leads to security restrictions bypass and privilege escalation.
Affected software
X.org Server
How to mitigate CVE-2026-93518
Install updates from vendor's website.