“A cybercriminal enters the network through brute force, or any credential abuse method.”
Just like any and all systems. Since 99% of Linux attack vulnerabilities are local and hands on, Local credential access is the main issue. Don’t let anyone near your machine and don’t give anyone credential root access you cannot personally hold accountable. And a very strong password that even their wildest dreams cannot figure out will prevent the 1% chance of brute force attacks from remote sources.
Quite a stat.