Introduction

Last December (which is a month ago), I learnt that there was a Linux kernel CTF challenge, called IPS, unsolved during VULNCON 2021.
At that moment, I was struggling exploiting the first bug that we eventually used to pwn GKE for kCTF and I thought it would be great to solve a CTF challenge and regain some confidence in kernel exploitation.

However, I struggled a little bit again with the CTF challenge (because I was and still am dumb) and finally solved it with an unintended solution.
Even though my solution was much harder than the intended solution, it was the first blood for this challenge.