The mode4and5 write functions in hw/display/cirrus_vga.c in Qemu allow local OS guest privileged users to cause a denial of service (out-of-bounds write access and Qemu process crash) via vectors related to dst calculation.
www.openwall.com/lists/oss-security/2017/10/12/16
www.securityfocus.com/bid/101262
access.redhat.com/errata/RHSA-2017:3368
access.redhat.com/errata/RHSA-2017:3369
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
access.redhat.com/errata/RHSA-2018:0516
bugzilla.redhat.com/show_bug.cgi?id=1501290
lists.debian.org/debian-lts-announce/2018/09/msg00007.html
lists.gnu.org/archive/html/qemu-devel/2017-10/msg02557.html
usn.ubuntu.com/3575-1/
www.debian.org/security/2018/dsa-4213