Use-after-free vulnerability in the sofree function in slirp/socket.c in QEMU (aka Quick Emulator) allows attackers to cause a denial of service (QEMU instance crash) by leveraging failure to properly clear ifq_so from pending packets.
www.debian.org/security/2017/dsa-3991
www.openwall.com/lists/oss-security/2017/08/29/6
www.securityfocus.com/bid/100534
access.redhat.com/errata/RHSA-2018:0816
access.redhat.com/errata/RHSA-2018:1104
access.redhat.com/errata/RHSA-2018:1113
bugzilla.redhat.com/show_bug.cgi?id=1486400
lists.gnu.org/archive/html/qemu-devel/2017-08/msg05201.html