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CVE-2026-50259

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland.

Impact

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.

Affected products

VendorProductAffected versions
X.OrgX Server
before 21.1.23
X.OrgXwayland
before 24.1.12
RedhatEnterprise Linux
Versions 7.0, 8.0, 9.0, 10.0

Weakness classification

CWE-121

References