x86_64/ecc-384-modp.asm in Nettle before 3.2 does not properly handle carry propagation and produces incorrect output in its implementation of the P-384 NIST elliptic curve, which allows attackers to have unspecified impact via unknown vectors.
https://lists.lysator.liu.se/pipermail/nettle-bugs/2015/003024.html
https://lists.gnu.org/archive/html/info-gnu/2016-01/msg00006.html
https://git.lysator.liu.se/nettle/nettle/commit/fa269b6ad06dd13c901dbd84a12e52b918a09cd7
http://www.ubuntu.com/usn/USN-2897-1
http://www.openwall.com/lists/oss-security/2016/02/03/1
http://www.openwall.com/lists/oss-security/2016/02/02/2
http://rhn.redhat.com/errata/RHSA-2016-2582.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00100.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00093.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00091.html