The do_write_pids function in lxcfs.c in LXCFS before 0.12 does not properly check permissions, which allows local users to gain privileges by writing a pid to the tasks file.Referenceshttps://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1512854http://www.ubuntu.com/usn/USN-2813-1https://github.com/lxc/lxcfs/commit/8ee2a503e102b1a43ec4d83113dc275ab20a869a
