When this article says "some of these are worse than Meltdown", what they mean is explained later:
At least one of these allows virtual machines to execute arbitrary code with the hypervisor's (VMM) privileges. This is a complete break of all x86 virtualization on Intel hardware until patched.
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[ 0.27 ms ] story [ 16.6 ms ] threadAt least one of these allows virtual machines to execute arbitrary code with the hypervisor's (VMM) privileges. This is a complete break of all x86 virtualization on Intel hardware until patched.