Attackers with a little more than a minute to spare can compromise Linux boxes by holding down the Enter key for 70 seconds, an act that gifts them a root initramfs shell .
The simple exploit exists due to a bug in the Linux Unified Key Setup (LUKS) used in popular variations of Linux.
With access to the shell, an attacker could then decrypt Linux machines. The attack also works on virtual Linux boxen in clouds.
Debian and Fedora are confirmed as suffering from this problem.