add reference in README

Aaron Lewis · Aaron Lewis · commit cee05e297b47 · 2018-01-20T17:14:31.000+08:00
diff --git a/README.md b/README.md
@@ -14,6 +14,9 @@ linux-kernel-exploits
 
 - [CVE-2017-1000112](./2017/CVE-2017-1000112)　　[a memory corruption due to UFO to non-UFO path switch]  
 
+- [CVE-2017-16939](./2017/CVE-2017-16939)　　[UAF in Netlink socket subsystem – XFRM] 
+(Linux kernel before 4.13.11)
+
 - [CVE-2017-7494](./2017/CVE-2017-7494)　　[Samba Remote execution]  
 (Samba 3.5.0-4.6.4/4.5.10/4.4.14)  
 
