Intel's 6th-generation Core "Skylake" processors have a bug inside, but it's likely that most users will never encounter it. The issue only comes up when a Windows or Linux-based PC with the chip is performing complex mathematical workloads.
PC and tablets with Skylake chips, such as Microsoft's Surface Pro 4 are affected by the bug, which was discovered by mathematicians while working for tor the Great Internet Mersenne Prime Search (GIMPS). Ars Technica received a statement from Intel confirming the bug:
"Intel has identified an issue that potentially affects the 6th Gen Intel Core family of products. This issue only occurs under certain complex workload conditions, like those that may be encountered when running applications like Prime95. In those cases, the processor may hang or cause unpredictable system behaviour."
Intel says they have created a fix for this issue, and it will be released as a BIOS update via the company's many hardware partners.
Source: Ars Technica