Race condition in the MutationObserver implementation in Blink, as used in Google Chrome before 47.0.2526.80, allows remote attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact by leveraging unanticipated object deletion.
http://googlechromereleases.blogspot.com/2015/12/stable-channel-update_8.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00017.html
http://rhn.redhat.com/errata/RHSA-2015-2618.html
https://code.google.com/p/chromium/issues/detail?id=557981
https://codereview.chromium.org/1463433002/
https://security.gentoo.org/glsa/201603-09