Race condition in the IPC object implementation in the Linux kernel through 4.2.3 allows local users to gain privileges by triggering an ipc_addid call that leads to uid and gid comparisons against uninitialized data, related to msg.c, shm.c, and util.c. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7613
