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Ubuntu 20.04: USN-7573-2 critical: X.Org X Server Denial of Service

ubuntu
Calendar Grey June 18, 2025
Dist Ubuntu Esm H88
Ubuntu updates address several vulnerabilities in the X.Org X Server. Immediate intervention and updates are necessary to fix these critical security flaws.
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

- 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.

Topics%20covered

Topics Covered

security advisory denial of service update important ubuntu xorg server

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7573-2

Topics%20covered

Topics Covered

security advisory denial of service update important ubuntu xorg server

Package Information

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