QEMU (aka Quick Emulator) built with the Virtio GPU Device emulator support is vulnerable to an information leakage issue. It could occur while processing 'VIRTIO_GPU_CMD_GET_CAPSET_INFO' command. A guest user/process could use this flaw to leak contents of the host memory bytes.
https://security.gentoo.org/glsa/201701-49
https://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg00019.html
http://www.securityfocus.com/bid/94763