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More information, including two papers on the CPU issues, has been released.  These papers are technical descriptions of the bugs.  Meltdown works on Intel processors only, Spectre works on Intel, AMD, and ARM processors.

The papers on the two bugs, called "Meltdown" and "Spectre" are available from

https://meltdownattack.com/

These papers are technical descriptions of the bugs.  Meltdown works on Intel processors only, Spectre works on Intel, AMD, and ARM processors.Readable discussion on the technical points

https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html

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msupdate msupdate

Microsoft released patches today - the patch is not enabled by default and has to be enabled manually after the patch is applied.  In addition, the patch will not be available for systems that are running incompatible anti-virus - some AV packages make calls into kernel memory that will cause a blue-screen-of-death if the patch is applied and enabled.  More information from Microsoft is available here

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Reportedly MacOS 10.13.2 has the fixes in it and was released December 6, 2017.

What Google Cloud, G Suite and Chrome customers need toknow about the industry-wide CPU vulnerability

https://www.blog.google/topics/google-cloud/what-google-cloud-g-suite-and-chrome-customers-need-know-about-industry-wide-cpu-vulnerability/