A PolicyKit vulnerability security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.10.

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Ubuntu Security Notice USN-5252-1
January 25, 2022

policykit-1 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

policykit-1 could be made to run programs as an administrator.

Software Description:
- policykit-1: framework for managing administrative policies and privileges

Details:

It was discovered that the PolicyKit pkexec tool incorrectly handled
command-line arguments. A local attacker could use this issue to escalate
privileges to an administrator.

Update instructions:

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

Ubuntu 21.10:
policykit-1 0.105-31ubuntu0.1

Ubuntu 20.04 LTS:
policykit-1 0.105-26ubuntu1.2

Ubuntu 18.04 LTS:
policykit-1 0.105-20ubuntu0.18.04.6

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

References:
  https://ubuntu.com/security/notices/USN-5252-1
CVE-2021-4034

Package Information:
  https://launchpad.net/ubuntu/+source/policykit-1/0.105-31ubuntu0.1
  https://launchpad.net/ubuntu/+source/policykit-1/0.105-26ubuntu1.2
  https://launchpad.net/ubuntu/+source/policykit-1/0.105-20ubuntu0.18.04.6