common/partial_circular_buffer.cc in Google Chrome before 43.0.2357.65 does not properly handle wraps, which allows remote attackers to bypass a sandbox protection mechanism or cause a denial of service (out-of-bounds write) via vectors that trigger a write operation with a large amount of data, related to the PartialCircularBuffer::Write and PartialCircularBuffer::DoWrite functions.
https://security.gentoo.org/glsa/201506-04
https://codereview.chromium.org/1061053002
https://code.google.com/p/chromium/issues/detail?id=474029
http://www.securitytracker.com/id/1032375
http://www.securityfocus.com/bid/74723
http://www.debian.org/security/2015/dsa-3267
http://lists.opensuse.org/opensuse-updates/2015-11/msg00015.html
http://lists.opensuse.org/opensuse-updates/2015-05/msg00091.html
http://googlechromereleases.blogspot.com/2015/05/stable-channel-update_19.html