Security researcher Mitchell Harper discovered a read-after-free in WebRTC due to the way tracks are handled. This results in a either a potentially exploitable crash or incorrect WebRTC behavior.
Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Mitchell Harper as the original reporter.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 7
Via RHSA-2015:0046 https://rhn.redhat.com/errata/RHSA-2015-0046.html