Enlarge / A Kaby Lake desktop CPU, not that you can tell the difference in a press shot. (credit: Intel) Under certain conditions, systems with Skylake or Kaby Lake processors can crash due to a bug that occurs when hyperthreading is enabled. Intel has fixed the bug in a microcode update, but until and unless you install the update, the recommendation is that hyperthreading be disabled in the system firmware. All Skylake and Kaby Lake processors appear to be affected, with one exception.