hw/usb/bus.c in QEMU 1.6.2 allows remote attackers to execute arbitrary code via crafted savevm data, which triggers a heap-based buffer overflow, related to "USB post load checks."
http://rhn.redhat.com/errata/RHSA-2014-0744.html
http://rhn.redhat.com/errata/RHSA-2014-0743.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134053.html