The vga_draw_text function in Qemu allows local OS guest privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) by leveraging improper memory address validation.
www.openwall.com/lists/oss-security/2018/01/15/2
www.securityfocus.com/bid/102518
access.redhat.com/errata/RHSA-2018:0816
access.redhat.com/errata/RHSA-2018:1104
access.redhat.com/errata/RHSA-2018:2162
lists.debian.org/debian-lts-announce/2018/09/msg00007.html
lists.gnu.org/archive/html/qemu-devel/2018-01/msg02597.html
usn.ubuntu.com/3575-1/
www.debian.org/security/2018/dsa-4213