CyberRota Analysis
This is a high severity vulnerability with a CVSS score of 7.8. See the original NVD description below for full technical details.
CVE
CVE-2026-50259
Severity
HIGH
CVSS
7.8
EPSS
0.17%
Original NVD Description
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Related CVEs
Other vulnerabilities affecting the same vendor(s)