A Rsyslog security update has been released for Ubuntu Linux 16.04 ESM.

USN-5404-2: Rsyslog vulnerability

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Ubuntu Security Notice USN-5404-2
May 24, 2022

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

- Ubuntu 16.04 ESM

Summary:

Rsyslog could be made to crash if it received a specially crafted request.

Software Description:
- rsyslog: Enhanced syslogd

Details:

USN-5404-1 addressed a vulnerability in Rsyslog. This update
provides the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

Pieter Agten discovered that Rsyslog incorrectly handled certain requests. An attacker could possibly use this issue to cause a crash.

Update instructions:

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

Ubuntu 16.04 ESM:
rsyslog 8.16.0-1ubuntu3.1+esm2

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

References:
https://ubuntu.com/security/notices/USN-5404-2
https://ubuntu.com/security/notices/USN-5404-1
CVE-2022-24903