[Keen-Minded]

What is the Microsoft patch number?

[Company Man]

There are several, depending on what version . build of Windowss you are running. I have retail Win10 fully updated except for the Fall Creators update, so version is 1607. Windows update dialog stated everything was up to date, but when I forced a manual scan, it downloaded "2018-01 Cumulative Update for Windows 10 Version 1607 for x64-based Systems (KB4056890)", which as I understand it, includes the Meltdown patch.