Multiple unspecified vulnerabilities in Google V8 before 4.7.80.23, as used in Google Chrome before 47.0.2526.80, allow attackers to cause a denial of service or possibly have other impact via unknown vectors, a different issue than CVE-2015-8478.
http://www.ubuntu.com/usn/USN-2860-1
http://rhn.redhat.com/errata/RHSA-2015-2618.html
http://googlechromereleases.blogspot.com/2015/12/stable-channel-update_8.html