The filesystem implementation in the Linux kernel before 3.13 performs certain operations on lists of files with an inappropriate locking approach, which allows local users to cause a denial of service (soft lockup or system crash) via unspecified use of Asynchronous I/O (AIO) operations.
http://rhn.redhat.com/errata/RHSA-2015-0290.html
http://rhn.redhat.com/errata/RHSA-2015-0694.html
http://www.openwall.com/lists/oss-security/2015/03/09/3
https://bugzilla.redhat.com/show_bug.cgi?id=1198503
https://github.com/torvalds/linux/commit/eee5cc2702929fd41cce28058dc6d6717f723f87