williamyf writes: ArsTechinca, The Register, and other outlets are reporting that today the XEN project patched a vulnerability in the ParaVirtualized VMs that allowed a guest to access the control OS of the hypervisor. Qubes researchers wrote: "On the other hand, it is really shocking that such a bug has been lurking in the core of the hypervisor for so many years. In our opinion the Xen project should rethink their coding guidelines and try to come up with practices and perhaps additional mechanisms that would not let similar flaws to plague the hypervisor ever again".
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