I believe there was a general decision that squeeze LTS would not be supported as a virtualisation host, so KVM, Xen, libvirt and QEMU are on the 'not supported' list.
However, virtualbox-ose is not on that list, and it has many CVEs reported against it and unfixed. Should it be added to the list or updated in squeeze? Ben. -- Ben Hutchings - Debian developer, member of Linux kernel and LTS teams
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