Description: A use after free issue exists in JavaScriptCore during page transitions. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory management. References: Bugzilla: https://bugs.webkit.org/show_bug.cgi?id=34321 Trac: http://trac.webkit.org/changeset/54129, http://trac.webkit.org/changeset/54141, http://trac.webkit.org/changeset/54265 Acknowledgements: Red Hat would like to thank Drew Yao of Apple Product Security for responsibly reporting this issue.
This is being made public now, we've been given the go-ahead from upstream to do so.