Ubuntu 25.10: X.Org X Server Critical Memory Crash 2025-7846-1

ubuntu

October 29, 2025

Several security issues were fixed in X.Org X Server.

Summary

Several security issues were fixed in X.Org X Server.

Software Description:

- xorg-server: X.Org X11 server

- xwayland: X server for running X clients under Wayland

Details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled

certain memory operations. An attacker could use these issues to cause the

X Server to crash, leading to a denial of service, obtain sensitive

information, or possibly execute arbitrary code.

Topics Covered

security advisory denial of service Ubuntu Xorg server Xwayland memory operation

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  xserver-xorg-core               2:21.1.18-1ubuntu1.1
  xwayland                        2:24.1.6-1ubuntu1.1

Ubuntu 25.04
  xserver-xorg-core               2:21.1.16-1ubuntu1.2
  xwayland                        2:24.1.6-1ubuntu0.2

Ubuntu 24.04 LTS
  xserver-xorg-core               2:21.1.12-1ubuntu1.5
  xwayland                        2:23.2.6-1ubuntu0.7

Ubuntu 22.04 LTS
  xserver-xorg-core               2:21.1.4-2ubuntu1.7~22.04.16
  xwayland                        2:22.1.1-1ubuntu0.20

After a standard system update you need to reboot your computer to make
all the necessary changes.