CVE-2017-2636 is a 7-year old race condition in the Linux kernel that was fixed by Alexander Popov in March, 2017. This vulnerability affected all major Linux distributions. It can be exploited to gain a local privilege escalation. In this presentation Alexander will describe the PoC exploit for CVE-2017-2636. He will explain the effective method of hitting the race condition and show the following exploitation techniques: turning double-free into use-after-free, heap spraying and stabilization, SMEP bypass.