QEMU is vulnerable to denial of service. Quick Emulator (QEMU) built with Network Block Device (NBD) Server support was vulnerable to a null-pointer dereference issue. The flaw could occur when releasing a client, which was not initialized due to failed negotiation. A remote user or process could exploit this flaw to crash the qemu-nbd server (denial of service).
www.debian.org/security/2017/dsa-3925
www.openwall.com/lists/oss-security/2017/06/12/1
www.securityfocus.com/bid/99011
access.redhat.com/errata/RHSA-2017:1681
access.redhat.com/errata/RHSA-2017:1682
access.redhat.com/errata/RHSA-2017:2408
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=1461837
lists.gnu.org/archive/html/qemu-devel/2017-05/msg06240.html
lists.gnu.org/archive/html/qemu-devel/2017-06/msg02321.html