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Ubuntu Security Notice USN-7573-2
June 18, 2025

xorg-server, xorg-server-hwe-16.04, xorg-server-hwe-18.04 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- xorg-server: X.Org X11 server
- xorg-server-hwe-18.04: X.Org X11 server
- xorg-server-hwe-16.04: X.Org X11 server

Details:

USN-7573-1 fixed several vulnerabilities in X.Org. This update provides
the corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and  Ubuntu
20.04 LTS.

Original advisory details:

 Nils Emmerich 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.

Update instructions:

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

Ubuntu 20.04 LTS
  xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.20+esm1
                                  Available with Ubuntu Pro
  xwayland                        2:1.20.13-1ubuntu1~20.04.20+esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  xserver-xorg-core               2:1.19.6-1ubuntu4.15+esm13
                                  Available with Ubuntu Pro
  xserver-xorg-core-hwe-18.04     2:1.20.8-2ubuntu2.2~18.04.11+esm5
                                  Available with Ubuntu Pro
  xwayland                        2:1.19.6-1ubuntu4.15+esm13
                                  Available with Ubuntu Pro
  xwayland-hwe-18.04              2:1.20.8-2ubuntu2.2~18.04.11+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm18
                                  Available with Ubuntu Pro
  xserver-xorg-core-hwe-16.04     2:1.19.6-1ubuntu4.1~16.04.6+esm10
                                  Available with Ubuntu Pro
  xwayland                        2:1.18.4-0ubuntu0.12+esm18
                                  Available with Ubuntu Pro
  xwayland-hwe-16.04              2:1.19.6-1ubuntu4.1~16.04.6+esm10
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7573-2
  https://ubuntu.com/security/notices/USN-7573-1
  CVE-2025-49175, CVE-2025-49176, CVE-2025-49178, CVE-2025-49179,
  CVE-2025-49180