Xorg: xwayland: heap overflow in xkbwritekeysyms()

Summary

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

Timeline

1. Feb 25, 2025, 3:54 PM UTCCVE published
2. Feb 25, 2025, 5:14 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Jun 29, 2026, 8:36 PM UTCRecord last updated

Affected versions

• xserver

  fixed in 21.1.16; From 22.0.0 · fixed in 24.1.6

• xorg-x11-server-Xwayland

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• xorg-x11-server

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• xorg-x11-server

  Version range not reported

• xorg-x11-server-Xwayland

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• tigervnc

  Version range not reported

• xorg-x11-server

  Version range not reported

• xorg-x11-server

  Version range not reported

• xorg-x11-server-Xwayland

  Version range not reported

References 17