Security updates for Friday

Security updates have been issued by Arch Linux (clamav), Debian (mailman, mpv, and simplesamlphp), Fedora (tomcat-native), openSUSE (docker, docker-runc, containerd,, kernel, mupdf, and python-mistune), Red Hat (kernel), and Ubuntu (mailman and postgresql-9.3, postgresql-9.5, postgresql-9.6).