A systemd regression update has been released for Ubuntu Linux 18.04 LTS.

USN-5583-2: systemd regression

==========================================================================
Ubuntu Security Notice USN-5583-2
September 14, 2022

systemd regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

USN-5583-1 caused a regression in systemd

Software Description:
- systemd: system and service manager

Details:

USN-5583-1 fixed vulnerabilities in systemd. Unfortunately this caused a
regression by introducing netowrking problems for some users. This update fixes
the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that systemd incorrectly handled certain DNS requests,
which leads to user-after-free vulnerability. An attacker could possibly use
this issue to cause a crash or execute arbitrary code. (CVE-2022-2526)

Update instructions:

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

Ubuntu 18.04 LTS:
systemd 237-3ubuntu10.56

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5583-2
  https://ubuntu.com/security/notices/USN-5583-1
  https://launchpad.net/bugs/1988119

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.56