It was found that vmstate_xhci_event field list was missing VMSTATE_END_OF_LIST() terminator and traversing through this list would result in out-of-bounds access during vm state saving and loading. Depending on how vmstate_xhci_event is placed in the qemu binary, this issue can range from non-issue, infinite loop to (potentially) privilege escalation in case the we end up with fields that have info and/or field_exist members initialized in a way that is useful for exploitation (most probably unlikely). In the worst case, attacker able to alter the migration data could use this flaw to to corrupt QEMU process memory. Upstream commit: http://git.qemu.org/?p=qemu.git;a=commit;h=3afca1d6d413592c2b78cf28f52fa24a586d8f56
Statement: Not vulnerable. This issue does not affect the versions of kvm package as shipped with Red Hat Enterprise Linux 5 and versions of qemu-kvm package as shipped with Red Hat Enterprise Linux 6 because they did not backport the commit that introduced this issue. This issue does not affect the versions of qemu-kvm package as shipped with Red Hat Enterprise Linux 7 because the layout of qemu-kvm binary does not allow successful exploitation of this flaw.
MITRE assigned CVE-2014-5263 to this issue: http://seclists.org/oss-sec/2014/q3/382