Security updates for Tuesday

Security updates have been issued by Debian (sitesummary), Fedora (jasper, knot-resolver, R, rkward, rpm-ostree, rpy, w3m, and xen), openSUSE (firefox), Red Hat (bash, coreutils, glibc, gnutls, kernel, libguestfs, ocaml, openssh, qemu-kvm, quagga, samba, samba4, subscription-manager, tigervnc, and wireshark), and Ubuntu (eglibc, glibc, firefox, freetype, gnutls26, NVIDIA graphics, and nvidia-graphics-drivers-375).