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Affected Component
Analysis
xwayland
Exploitable
Name
CVE-2026-50258
Description
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/security/cve/CVE-2026-50258Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2485383Issue Tracking
https://redhat.atlassian.net/browse/PSIRTSUPT-16950Permissions Required
Analysis#
Vulnerability Ratings#
7.8
CVSSv31
NaN
other