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USN-5244-2: DBus vulnerability

9 May 2022

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



  • dbus - simple interprocess messaging system


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
Ubuntu 18.04

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


Related notices

  • USN-5244-1: dbus-tests, libdbus-1-3, dbus, libdbus-1-dev, dbus-x11, dbus-user-session, dbus-1-doc