The RenderCounter::updateCounter function in core/rendering/RenderCounter.cpp in Blink, as used in Google Chrome before 41.0.2272.76, does not force a relayout operation and consequently does not initialize memory for a data structure, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted Cascading Style Sheets (CSS) token sequence.
googlechromereleases.blogspot.com/2015/03/stable-channel-update.html
rhn.redhat.com/errata/RHSA-2015-0627.html
www.securityfocus.com/bid/72901
www.ubuntu.com/usn/USN-2521-1
code.google.com/p/chromium/issues/detail?id=444707
security.gentoo.org/glsa/201503-12
src.chromium.org/viewvc/blink?revision=188180&view=revision