Red Hat Security Advisory 2013-0847-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way the Xen hypervisor AMD IOMMU driver handled interrupt remapping entries. By default, a single interrupt remapping table is used, and old interrupt remapping entries are not cleared, potentially allowing a privileged guest user in a guest that has a passed-through, bus-mastering capable PCI device to inject interrupt entries into others guests, including the privileged management domain, leading to a denial of service.
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Debian Linux Security Advisory 2636-2 - A regression in combination with pygrub has been discovered. For the stable distribution (squeeze), these problems have been fixed in version 4.0.1-5.8.
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Debian Linux Security Advisory 2636-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor.
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