Security researcher SkyLined reported a use-after-free issue in how audio is handled through the Web Audio API during MediaStream playback through interactions with the Web Audio API. This results in a potentially exploitable crash. External Reference: https://www.mozilla.org/security/announce/2015/mfsa2015-81.html Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges SkyLined as the original reporter. Statement: This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.