Heap-based buffer overflow in X.org Server - CVE-2026-93520
Published: October 20, 2026
Vulnerability identifier: #VU156267
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-2026-93520
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the XkbChangeKeycodeRange function. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.
Affected software
X.org Server
How to mitigate CVE-2026-93520
Install updates from vendor's website.