The ObjectBackedNativeHandler class in extensions/renderer/object_backed_native_handler.cc in the extensions subsystem in Google Chrome before 47.0.2526.80 improperly implements handler functions, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that leverage "type confusion."
https://security.gentoo.org/glsa/201603-09
https://codereview.chromium.org/1422383003/
https://code.google.com/p/chromium/issues/detail?id=548273
http://www.securityfocus.com/bid/78734
http://www.debian.org/security/2015/dsa-3418
http://rhn.redhat.com/errata/RHSA-2015-2618.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00016.html
http://googlechromereleases.blogspot.com/2015/12/stable-channel-update_8.html