The Linux Mint maintainers of the Linux Mint project have addressed a security bug that could have allowed attackers to bypass the OS screensaver. The bug is triggered when users press the key on the on-screen keyboard, this causes the crash of the Cinnamon desktop process. The vulnerability was fixed with the release of a patch for Mint 19.x, Mint 20.x and LMDE 4.2+. It was discovered by two children that were playing on their dads computer.”]
Source: https://securityaffairs.co/wordpress/113518/hacking/screensaver-bypass-linux-mint.html