This Hack Gives Linux Root Shell Just By Pressing 'ENTER' for 70 Seconds

According to the article, the flaw actually is in the way the Cryptsetup utility handles password failures for the decryption process when a system boots up, which lets a user retry the password multiple times.
Here are the technical details for our intrepid RP penguins:
http://hmarco.org/bugs/CVE-2016-4484/CVE-2016-4484_cryptsetup_initrd_shell.html