Heap-based buffer overflow in Cirrus CLGD 54xx VGA Emulator in Quick Emulator (Qemu) 2.8 and earlier allows local guest OS users to execute arbitrary code or cause a denial of service (crash) via vectors related to a VNC client updating its display after a VGA operation.
https://support.citrix.com/article/CTX230138
https://security.gentoo.org/glsa/201706-03
https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
https://bugzilla.redhat.com/show_bug.cgi?id=1430056
https://access.redhat.com/errata/RHSA-2017:1441
https://access.redhat.com/errata/RHSA-2017:1430
https://access.redhat.com/errata/RHSA-2017:1206
https://access.redhat.com/errata/RHSA-2017:1205
https://access.redhat.com/errata/RHSA-2017:0988
https://access.redhat.com/errata/RHSA-2017:0984
https://access.redhat.com/errata/RHSA-2017:0983
https://access.redhat.com/errata/RHSA-2017:0982
https://access.redhat.com/errata/RHSA-2017:0981
https://access.redhat.com/errata/RHSA-2017:0980
http://www.securityfocus.com/bid/97955
http://www.securityfocus.com/bid/102129