Memory leak in the ehci_process_itd function in hw/usb/hcd-ehci.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (memory consumption) via a large number of crafted buffer page select (PG) indexes.
http://lists.opensuse.org/opensuse-updates/2016-12/msg00140.html
https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg06609.html