A Directory Traversal vulnerability exists in the GNU patch before 2.7.4. A remote attacker can write to arbitrary files via a symlink attack in a patch file. NOTE: this issue exists because of an incomplete fix for CVE-2015-1196.
https://bugzilla.redhat.com/show_bug.cgi?id=1186764
http://www.ubuntu.com/usn/USN-2651-1