A stack-based buffer overflow in the clntudpcall function in sunrpc/clntudp.c in the GNU C Library (aka glibc or libc6) allows remote servers to cause a denial of service (crash) or possibly unspecified other impact via a flood of crafted ICMP and UDP packets (CVE-2016-4429).
A similar issue was fixed in lntdgcall in src/clnt_dg.c in libtirpc package as part of this update.
Other fixes in this update: - Fix static dlopen default library search path [Glibc BZ #17250] - grantpt: trust the kernel about pty group and permission mode [Glibc BZ #19347]