The MITRE CVE dictionary describes this issue as:
Buffer overflow in the virtio subsystem in qemu-kvm 0.14.0 and earlier allows privileged guest users to cause a denial of service (guest crash) or gain privileges via a crafted indirect descriptor related to "virtqueue in and out requests."
Find out more about CVE-2011-2212 from the
MITRE CVE dictionary dictionary and
This issue only affects Red Hat Enterprise Linux 6. The version of the qemu/kvm
as shipped with Red Hat Enterprise Linux 5 is not affected because it does not provide support for indirect descriptors.