Intel and AMD engineers have stepped in at the eleventh to deal with a code contribution from a Microsoft developer that could have broken Linux 6.13 on some systems. So this patch never went live.
Microsoft is notable for dubious quality control standards regarding releases of its flagship operating system, Windows. That one of its engineers should drop some dodgy code into the Linux kernel is not hugely surprising, and the unfortunate individual is not the first and will not be the last to do so, regardless of their employer.
Yes, it is not just Microsoft which has caused these problems for the Linux kernel, but one has to wonder about the ongoing vulnerabilities that Windows OS has had over its many decades of existence. One could say Windows is a horrifically complex collection of code, but I think the same can be said for Linux too (with patches being submitted by many devs all around the world, and the Linux kernel driving so many different types of hardware, more than Windows itself).
I suppose the difference in expectations comes from the remuneration of the devs. I’d expect that Microsoft pays their devs in hard cash to do their jobs, whilst Linux devs do it mostly for love.
See https://www.theregister.com/2025/01/14/microsoft_linux_change_pulled