host : escapeme.chal.ctf.westerns.tokyo

port : 16359

$ uname -a
Linux pwnable-escapeme 4.15.0-1017-gcp #18-Ubuntu SMP Fri Aug 10 10:13:17 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:    18.04
Codename:   bionic

Hint for flag2: check carefully how physical memory of kernel managed.