We don't know what the actual bug is yet, or how easy it would be to exploit it. People are speculating that either: a) It would allow any non-root process to

We don't know what the actual bug is yet, or how easy it would be to exploit it. People are speculating that either: a) It would allow any non-root process to read full memory, including the kernel and other processes, or b) It would allow one cloud VM to read full memory of other cloud VMs on the same physical machine, or c) With enough cleverness, it would allow even sandboxed Javascript on a web page to read full memory of the computer that it is running on.