qemu-nbd in QEMU (aka Quick Emulator) does not ignore SIGPIPE, which allows remote attackers to cause a denial of service (daemon crash) by disconnecting during a server-to-client reply attempt.
www.debian.org/security/2017/dsa-3920
www.openwall.com/lists/oss-security/2017/06/29/1
www.securityfocus.com/bid/99513
access.redhat.com/errata/RHSA-2017:2390
access.redhat.com/errata/RHSA-2017:2445
access.redhat.com/errata/RHSA-2017:3466
access.redhat.com/errata/RHSA-2017:3470
access.redhat.com/errata/RHSA-2017:3471
access.redhat.com/errata/RHSA-2017:3472
access.redhat.com/errata/RHSA-2017:3473
access.redhat.com/errata/RHSA-2017:3474
bugzilla.redhat.com/show_bug.cgi?id=1466190
lists.debian.org/debian-lts-announce/2018/11/msg00038.html
lists.gnu.org/archive/html/qemu-devel/2017-06/msg02693.html