Io ho la release 16.04, quindi sono salva (almeno sembra)
Ubuntu 14.04 is apparently affected because the default install includes gstreamer-0.10, but most media handling applications use gstreamer-1.0 which is also installed. The exact circumstances under which Ubuntu 14.04 uses the vulnerable gstreamer-0.10 are not clear. The Ubuntu 16.04 default install has only gstreamer-1.0, which is not affected by this vulnerability.