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Also, Apple and Microsoft are not an “OS”. This is a poorly written article unfortunately.

Not necessarily, maybe they all contributed their own (incorrect) fixes?

Many of them use different versions of the same underlying Linux kernel, sometimes put together in different ways.

It seems improbable that there are multiple ways of putting together the kernel's handling of mov ss.

As an example, Red Hat doesn’t ship major kernel upgrades except with major releases. If you’re running RHEL 6, you’re still on a 2.6 kernel and the fact that someone patched 4.x probably doesn’t help you all that much unless you have the time to backport the change and confirm that it doesn’t break something else.