They actually recently released information about this - there were multiple vulnerabilities in xen.civwould assume they were trying to keep the information quiet until the issue was fully resolved.
If you read the specific vulnerabilities that were released you'd see an embargo was in place. According to Xen.org, Linode is on the predisclosure list. Seems they got the information, fixed the issue, and were able to announce it once the Xen guys did.
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They actually recently released information about this - there were multiple vulnerabilities in xen.civwould assume they were trying to keep the information quiet until the issue was fully resolved.
http://blog.linode.com/2012/06/13/xen-security-advisories-an...
If you read the specific vulnerabilities that were released you'd see an embargo was in place. According to Xen.org, Linode is on the predisclosure list. Seems they got the information, fixed the issue, and were able to announce it once the Xen guys did.