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CVE Vendors Products Updated CVSS v3.1
CVE-2026-50259 3 Redhat, X.org, Xorg 12 Enterprise Linux, Enterprise Linux Eus, Rhel Aus and 9 more 2026-08-04 7.8 High
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.