The FrameLoader::startLoad function in WebKit/Source/core/loader/FrameLoader.cpp in Blink, as used in Google Chrome before 51.0.2704.79, does not prevent frame navigations during DocumentLoader detach operations, which allows remote attackers to bypass the Same Origin Policy via crafted JavaScript code.
googlechromereleases.blogspot.com/2016/06/stable-channel-update.html
lists.opensuse.org/opensuse-security-announce/2016-06/msg00003.html
lists.opensuse.org/opensuse-security-announce/2016-06/msg00004.html
lists.opensuse.org/opensuse-security-announce/2016-06/msg00005.html
www.debian.org/security/2016/dsa-3594
www.securitytracker.com/id/1036026
www.ubuntu.com/usn/USN-2992-1
access.redhat.com/errata/RHSA-2016:1201
codereview.chromium.org/2021373003
crbug.com/613266