CVE-2016-2854
The aufs module for the Linux kernel 3.x and 4.x does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.
Date published : 2016-05-02
http://www.securityfocus.com/bid/96838
http://www.halfdog.net/Security/2016/AufsPrivilegeEscalationInUserNamespaces/