A Linux installation can be simply hacked by using a live USB/CD, gaining root access on the live distro, chrooting to the target filesystem and running passwd root. One can use grub too. There may be some other methods as well.What is the most efficient way of defending against hacking the installation from Live USB provided the system runs on an SSD drive (TRIM and encryption are said not to work well)?
How to defend against a Live USB computer hack
linux;boot;security