This is only true if;
1) It is a local user compiling the hack. Doesn't work over a network. As a Senior Network Admin I never, never give local users the rights to compile on their systems much less a server. Dah!!!
2) If you have compiled a kernel using the 'PERF_EVENTS' option. Rare, very rare.
Just point me to ONE system in the wild that actually has been cracked by this.
You Windows people just can't accept that you have a bad O.S. that you have to blow up such non-events as this.
Get real, potential for cracks is not the same as the 100's of million Windows systems that make up the bot'nets of the internet.
It it's not on fire,
It's a software problem.