The Image11::map function in renderer/d3d/d3d11/Image11.cpp in libANGLE, as used in Google Chrome before 46.0.2490.71, mishandles mapping failures after device-lost events, which allows remote attackers to cause a denial of service (invalid read or write) or possibly have unspecified other impact via vectors involving a removed device.
https://security.gentoo.org/glsa/201603-09
https://code.google.com/p/chromium/issues/detail?id=519642
https://chromium.googlesource.com/angle/angle.git/+/39939686b3731eaaf6c0b639ab64db0277c72475
http://www.securitytracker.com/id/1033816
http://www.securityfocus.com/bid/77071
http://www.debian.org/security/2015/dsa-3376
http://rhn.redhat.com/errata/RHSA-2015-1912.html
http://googlechromereleases.blogspot.com/2015/10/stable-channel-update.html