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[USN-7573-2] X.Org X Server vulnerabilities

Posted on 18 June 2025
Ubuntu Security

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

xorg-server, xorg-server-hwe-16.04, xorg-server-hwe-18.04 vulnerabilities
==========================================================================
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


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