libvirt-domain.c in libvirt before 1.3.1 supports virDomainGetTime API calls by guest agents with an RO connection, even though an RW connection was supposed to be required, a different vulnerability than CVE-2019-3886.
https://lists.debian.org/debian-lts-announce/2019/04/msg00032.html
https://github.com/libvirt/libvirt/compare/11288f5...8fd6867
https://github.com/libvirt/libvirt/commit/506e9d6c2d4baaf580d489fff0690c0ff2ff588f