Pwnkit: Local Privilege Escalation in polkit's pkexec (CVE-2021-4034)
> pkexec is installed by default on all major Linux distributions (we
  exploited Ubuntu, Debian, Fedora, CentOS, and other distributions are
  probably also exploitable);<p>I don't find it on any of the servers I manage, it appears to be installed with graphical desktop only?