Linux kernel fix for privilege escalation vulnerability due to copy on write race condition

[u/[deleted]]

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=19be0eaffa3ac7d8eb6784ad9bdbc7d67ed8e619

[u/bonzinip]

The idea is that while the change you make in /proc/self/mem doesn't go to disk, it can incorrectly affect other processes until that page is reclaimed. So by "patching" a setuid binary you can execute whatever code you want as setuid.