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.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[Qemu-devel] 20150331 [PATCH][XSA-126] xen: limit guest control of PCI command register
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