A serious bug in the microcode for Intel's Kaby Lake and Skylake CPUs has been found. The bug can cause misbehavior of software and loss of data. It affects all 6th and 7th-gen CPUs with Hyperthreading enabled.
https://www.notebookcheck.net/Serious-Hyperthreading-bug-affects-Intel-Skylake-and-Kaby-Lake-architectures.230338.0.html