CVE-2016-1575 (linux_kernel, ubuntu_core, ubuntu_linux, ubuntu_touch)
The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.
Source: CVE-2016-1575 (linux_kernel, ubuntu_core, ubuntu_linux, ubuntu_touch)