Security updates for Tuesday

Security updates have been issued by CentOS (389-ds-base, dhcp, firefox, glib2, hivex, kernel, postgresql, qemu-kvm, qt5-qtimageformats, samba, and xorg-x11-server), Fedora (kernel and kernel-tools), Oracle (kernel and postgresql), Red Hat (dhcp and gupnp), Scientific Linux (gupnp and postgresql), SUSE (postgresql10 and xterm), and Ubuntu (imagemagick).