The serious thing about it: A complete fix is possible only in the course of hardware changes if it is possible at all in the near future. Until further notice, Intel wants to proceed against software side so that it can mitigate the problem at least or contain the consequences. This has recently been done on Linux, first steps have already been taken in mid-November on the Windows NT kernel.
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The problem here is that software fixes represent a massive workload brake. Also affected are virtualizations such as Amazon EC2 and Google Compute Engine, which concerns the various software vendors, according to Computer Base also macOS and other operating systems that are affected.
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This was first known about Linux, which is due to the open model of the OS. Linux has been heavily screwed to the virtual memory subsystem, it will also try to hurry up, which is just another indication of the severity of the gap. According to unconfirmed reports, an Intel CPU can be forced to load and allow storage areas or processes without performing otherwise required security steps. It also represents what is known as the Rowhammer.
The effects of the gap or its actual scope are currently unclear because, in addition to the CPUs of the x86 architecture, which is at home or in offices, you should not forget cloud and server computers. Intel has not commented on that yet. Owners of AMD processors can be reassured, they are not affected.