Microsoft has temporarily stopped distributing patches to computers and devices running AMD processors after acknowledging that its Windows security updates for the vulnerabilities known as Meltdown and Spectre left some computers in an “unbootable state.”

What are Meltdown and Spectre? GeekWire’s guide to the problems with the world’s computer chips

The development is a setback for AMD, which was more narrowly impacted by the bugs than its rival Intel was. AMD said previously that its chips were vulnerable to only one variant of Spectre, and not vulnerable to Meltdown. But the overall fix appears to have caused problems for AMD machines regardless.

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