Security updates for Tuesday

Security updates have been issued by Arch Linux (firefox and thunderbird), Debian (sox and vcftools), Fedora (safelease and sharpziplib), openSUSE (chromium, evolution, graphviz, nmap, systemd, transfig, and ucode-intel), Red Hat (pacemaker), SUSE (curl, libvirt, openssl, php7, php72, and systemd), and Ubuntu (gnome-desktop3, keepalived, and samba).