X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling

Summary

X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-805. Affected package(s): tigervnc, xorg-x11-server-Xwayland, xorg-x11-server. Resolved in Red Hat advisory RHSA-2026:24341 — update the affected packages (`sudo dnf update`).