The SharedMemory::Create function in memory/shared_memory_posix.cc in Google Chrome before 29.0.1547.57 uses weak permissions under /dev/shm/, which allows attackers to obtain sensitive information via direct access to a POSIX shared-memory file.
https://src.chromium.org/viewvc/chrome?revision=209814&view=revision
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17583
http://www.debian.org/security/2013/dsa-2741
http://googlechromereleases.blogspot.com/2013/08/stable-channel-update.html