Over the course of the last few days, there has been much said online about a security flaw which is affecting the X86 CPU architecture and more specifically Intel CPUs*. This is an issue which has been known since earlier in 2017 but has only recently started doing the rounds. The issue was uncovered by Google (https://security.googleblog.com/2018/01/todays-cpu-vulnerability-what-you-need.html?m=1) and was not scheduled to be made public just yet, however, growing information and leaks online led Google to release it early. The issue has also been logged under three CVEs: CVE-2017-5715, CVE-2017-5753, and CVE-2017-5754. Microsoft also has their own article at https://support.microsoft.com/en-us/help/4073119/windows-client-guidance-for-it-pros-to-protect-against-speculative-exe.
The early release by Google prompted various things that were already in-play to also happen early. Microsoft was forced to release the hotfix for Windows immediately and the Microsoft Azure planned VM maintenance which was scheduled for the 10th January has been brought forward to happen almost immediately.
* There are numerous reports including the original publication from Google that the issues also affect ARM and AMD CPUs as well. I do not wish to get embroiled in a debate whether or not AMD and ARM are affected as there is arguments coming from both sides. For the purposes of this article, I will focus on Intel as we know 100% that their processors are affected. Intel is keen to point out that while they are still affected, CPUs based on the newer platforms like Skylake and Kaby Lake will experience a lesser performance drop-off.