Local privilege escalation exploit for polkit pkexec vulnerability (CVE-2021-4034). Grants root shell on vulnerable Linux systems.
/usr/bin/pkexec --version # ≤ 0.120
uname -r # 5.3.0-42 5.4.0-107 OR cat /etc/issue
ls -la /usr/bin/pkexec # Should have SUID bit