The KVM implementation in the Linux kernel before 3.3.4 does not properly
manage the relationships between memory slots and the iommu, which allows
guest OS users to cause a denial of service (memory leak and host OS crash)
by leveraging administrative access to the guest OS to conduct hotunplug
and hotplug operations on devices.

A flaw was discovered in the Linux kernel's KVM (kernel virtual machine).
An administrative user in the guest OS could leverage this flaw to cause a
denial of service in the host OS.