As usual there are two (not so ?) new security flaws. But this time it is related to the hardware and more specifically to the processor by 3 different vendors (AMD, ARM and Intel).
So here is a synthesis of every information I have collected on the Net. Thanks to all people who reported and/or provided links/information/tools/PoC.
My obvious recommendations are to patch ASAP, but as we know it is not so obvious. Maybe you can start by patching web browser and apply correct settings, there will be some exploit in the wild in a couple of hours/days. Another important information is the relationship between Anti-Virus and windows patches, there are some recommendations about this on the MS website