Xorg-x11-server: reattaching to different master device may lead to out-of-bounds memory access

Summary

An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a device frozen by a sync grab is reattached to a different master device. This issue may lead to an application crash, local privilege escalation (if the server runs with extended privileges), or remote code execution in SSH X11 forwarding environments.

Timeline

1. Feb 9, 2024, 6:29 AM UTCCVE published
2. Feb 12, 2024, 4:50 PM UTCCISA SSVC assessment

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

3. Nov 6, 2025, 8:51 PM UTCRecord last updated

Affected versions

• xorg-server

  From 21.1.0 · fixed in 21.1.11

• tigervnc

  Version range not reported

• xorg-x11-server

  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

• 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

• xorg-x11-server

  Version range not reported

References 17