The KVM implementation in the Linux kernel through 4.20.5 has an Information Leak.
https://usn.ubuntu.com/3933-2/
https://usn.ubuntu.com/3933-1/
https://usn.ubuntu.com/3932-2/
https://usn.ubuntu.com/3932-1/
https://usn.ubuntu.com/3931-2/
https://usn.ubuntu.com/3931-1/
https://usn.ubuntu.com/3930-2/
https://usn.ubuntu.com/3930-1/
https://security.netapp.com/advisory/ntap-20190404-0002/
https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
https://github.com/torvalds/linux/commits/master/arch/x86/kvm
https://bugs.chromium.org/p/project-zero/issues/detail?id=1759
https://access.redhat.com/errata/RHSA-2019:3517
https://access.redhat.com/errata/RHSA-2019:3309
https://access.redhat.com/errata/RHSA-2019:2043
https://access.redhat.com/errata/RHSA-2019:2029
http://www.securityfocus.com/bid/106963
http://www.openwall.com/lists/oss-security/2019/02/18/2
http://packetstormsecurity.com/files/151712/KVM-kvm_inject_page_fault-Uninitialized-Memory-Leak.html
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00042.html