Memory leak in the keyboard input event handlers support in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial of service (host memory consumption) by rapidly generating large keyboard events.
https://security.gentoo.org/glsa/201706-03
https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg05599.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
https://access.redhat.com/errata/RHSA-2017:2408