Actually, it affects more than your local desktop computer. It affects the websites you connect to. I don't believe it matters what you connect from (Windows, Linux, etc.) And since the vast majority of websites you connect to are running on Linux servers, it affects everyone. There are very few Microsoft websites are out there in the grand scheme of things - sorry Bill Gates. As I read the advisory, it requires a man-in-the-middle attack, which are not necessarily easy to implement, and not on a wide scale. So while it is a security flaw, it is not one that could be widely exploited.