PwnKit: Local Privilege Escalation Vulnerability Discovered in polkit’s pkexec (CVE-2021-4034) | Qualys Security Blog

The Qualys Research Team has discovered a memory corruption vulnerability in polkit's pkexec, a SUID-root program that is installed by default on every major Linux distribution.

Nettle and Sequioa for Encryption (as GnuPG Alternative)

Concerns about GnuPG's Koch facilitating or allowing practices that aren't secure and are even proprietary raise concern among privacy and security specialists; alternatives exist already