Kaby Lake and can't disable HT
I happen to have a rather nice* Dell XPS 8920 at work. Last BIOS is from March. There's no option to disable HyperThreading.
So far the only things crashing on me are PulseAudio and bluetoothd, and I have no idea if they crash because of this bug or just because there are bugs that need to be ironed out in drivers or the software.
*It's nice after putting up a good fight when I installed Ubuntu on it. I had to mix and match many Internet forum posts in order to win the battle.