The bad news: Intel has previously warned that the microcode update it issued to provide some processor-based mitigation for some kinds of Spectre attack was causing machines with Haswell and Broadwell processors to reboot. It turns out that the problems are more widespread than previously reported: the chip company is now saying that Ivy Bridge, Sandy Bridge, Skylake, and Kaby Lake systems are affected, too.
https://arstechnica.com/gadgets/2018/01/good-newsbad-news-in-quest-to-get-meltdown-and-spectre-patched/