QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
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{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "libxenstore3.0": "4.4.1-0ubuntu0.14.04.5", "libxen-4.4": "4.4.1-0ubuntu0.14.04.5", "libxen-ocaml-dev": "4.4.1-0ubuntu0.14.04.5", "libxen-dev": "4.4.1-0ubuntu0.14.04.5", "xen-hypervisor-4.3-amd64": "4.4.1-0ubuntu0.14.04.5", "xen-hypervisor-4.3-armhf": "4.4.1-0ubuntu0.14.04.5", "xen-system-amd64": "4.4.1-0ubuntu0.14.04.5", "xen-hypervisor-4.4-arm64": "4.4.1-0ubuntu0.14.04.5", "libxen-ocaml": "4.4.1-0ubuntu0.14.04.5", "xenstore-utils": "4.4.1-0ubuntu0.14.04.5", "xen-system-armhf": "4.4.1-0ubuntu0.14.04.5", "xen-hypervisor-4.1-amd64": "4.4.1-0ubuntu0.14.04.5", "xen-hypervisor-4.4-armhf": "4.4.1-0ubuntu0.14.04.5", "xen-hypervisor-4.4-amd64": "4.4.1-0ubuntu0.14.04.5", "xen-utils-common": "4.4.1-0ubuntu0.14.04.5", "xen-utils-4.4": "4.4.1-0ubuntu0.14.04.5", "xen-system-arm64": "4.4.1-0ubuntu0.14.04.5" } ] }