If you use Debian or Ubuntu/ (probably many derived distributions are also vulnerable, but we have not tested), and you have encrypted the system partition, then your systems is vulnerable.
CVE-2016-4484: Cryptsetup Initrd root Shell
November 11th, 2016 - Disclosed at DeepSec 2016, Viena.
CVE-2016-4484: Cryptsetup Initrd root Shell
November 11th, 2016 - Disclosed at DeepSec 2016, Viena.
Code:
http://hmarco.org/bugs/CVE-2016-4484/CVE-2016-4484_cryptsetup_initrd_shell.html