This is a simple PoC of CVE-2016-5195 (AKA Dirty COW) against an Ubuntu 16.04 VM spun up on Scaleway.
After downloading and compiling the PoC, we then create a file named /tmp/.pwn. We can place what ever we want in this script, so long as it ends in /bin/bash. We then save this file, and set it to executable.
We now use the PoC to overwrite the first line in /etc/passwd, changing the default shell for the root user to point to our malicious /tmp/.pwn script.
Next time root logs in, the script /tmp/.pwn will execute. We of course could put a reverse shell in here, or any other piece of nastiness in order to elevate to root.
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