Security researcher Abhishek Arya (Inferno) of the Google Chrome Security Team used the Address Sanitizer tool to discover to memory corruption crashes during 2D graphics rendering due to problems in Off Main Thread Compositing. These crashes are potentially exploitable. External Reference: http://www.mozilla.org/security/announce/2015/mfsa2015-38.html Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Abhishek Arya 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.