Google Chrome before 50.0.2661.75 does not properly consider that frame removal may occur during callback execution, which allows remote attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact via a crafted extension.
googlechromereleases.blogspot.com/2016/04/stable-channel-update_13.html
lists.opensuse.org/opensuse-security-announce/2016-04/msg00040.html
lists.opensuse.org/opensuse-security-announce/2016-04/msg00041.html
lists.opensuse.org/opensuse-security-announce/2016-04/msg00049.html
lists.opensuse.org/opensuse-security-announce/2016-04/msg00050.html
rhn.redhat.com/errata/RHSA-2016-0638.html
www.debian.org/security/2016/dsa-3549
www.ubuntu.com/usn/USN-2955-1
codereview.chromium.org/1642283002
crbug.com/582008
security.gentoo.org/glsa/201605-02