An out-of-bounds memory access issue was found in Quick Emulator (QEMU) before 1.7.2 in the VNC display driver. This flaw could occur while refreshing the VNC display surface area in the 'vnc_refresh_server_surface'. A user inside a guest could use this flaw to crash the QEMU process.
https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=bea60dd7679364493a0d7f5b54316c767cf894ef
https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=9f64916da20eea67121d544698676295bbb105a7
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2633
https://access.redhat.com/errata/RHSA-2017:1856
https://access.redhat.com/errata/RHSA-2017:1441
https://access.redhat.com/errata/RHSA-2017:1206
https://access.redhat.com/errata/RHSA-2017:1205