Integer overflow in the xfs_acl_from_disk function in fs/xfs/xfs_acl.c in the Linux kernel before 3.1.9 allows local users to cause a denial of service (panic) via a filesystem with a malformed ACL, leading to a heap-based buffer overflow.
https://github.com/torvalds/linux/commit/fa8b18edd752a8b4e9d1ee2cd615b82c93cf8bba
https://github.com/torvalds/linux/commit/093019cf1b18dd31b2c3b77acce4e000e2cbc9ce
https://bugzilla.redhat.com/show_bug.cgi?id=773280
http://www.openwall.com/lists/oss-security/2012/01/10/11