A DBus security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

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Ubuntu Security Notice USN-5244-2
May 09, 2022

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

DBus could be made to crash if it received specially crafted
input.

Software Description:
- dbus: simple interprocess messaging system

Details:

USN-5244-1 fixed a vulnerability in DBus. This update provides
the corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

Daniel Onaca discovered that DBus contained a use-after-free vulnerability,
caused by the incorrect handling of usernames sharing the same UID. An
attacker could possibly use this issue to cause DBus to crash, resulting
in a denial of service.

Update instructions:

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

Ubuntu 20.04 LTS:
dbus 1.12.16-2ubuntu2.2
libdbus-1-3 1.12.16-2ubuntu2.2

Ubuntu 18.04 LTS:
dbus 1.12.2-1ubuntu1.3
libdbus-1-3 1.12.2-1ubuntu1.3

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

References:
https://ubuntu.com/security/notices/USN-5244-2
https://ubuntu.com/security/notices/USN-5244-1
CVE-2020-35512

Package Information:
https://launchpad.net/ubuntu/+source/dbus/1.12.16-2ubuntu2.2
https://launchpad.net/ubuntu/+source/dbus/1.12.2-1ubuntu1.3