Submitted by securityadmin on
http://rhn.redhat.com/errata/RHSA-2009-1659.html
A moderate security vulnerability could allow a malicious user on a
guest VM to cause a DoS attack on the underlying host.
This patch also updates a few other non-security related bugs in the
software as explained at the above link.
It is recommended to update to a version of KVM that includes these
security fixes.