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.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.