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.
References
Configurations
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History
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Information
Published : 2026-06-05 12:16
Updated : 2026-08-05 13:23
NVD link : CVE-2026-50259
Mitre link : CVE-2026-50259
CVE.ORG link : CVE-2026-50259
JSON object : View
Products Affected
x.org
- x_server
- xwayland
redhat
- enterprise_linux
CWE
CWE-121
Stack-based Buffer Overflow
