The recent two. FailCopy and DirtyFrag and FreeBSD with Execve.
2 - Linux 1 - FreeBSD.
Of course, all OS have had past-time exploits. Three now have made the news.
Three. I don't know if this has a name yet... https://news.ycombinator.com/item?id=48067734
Naturally they don't do blog posts about what they find.
But windows still has a root and a lower privilege user. You typically need to click on "run as admin" to elevate privileges to, for example, alter system binaries.
It he talked about Android, I would have mentioned Project Zero.
Don't twist the meaning of posts.