A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 private keys.
http://rhn.redhat.com/errata/RHSA-2017-1415.html
https://access.redhat.com/errata/RHSA-2017:1413
https://access.redhat.com/errata/RHSA-2017:1414
https://access.redhat.com/errata/RHSA-2017:1801
https://access.redhat.com/errata/RHSA-2017:1802
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-7056
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=8aed2a7548362e88e84a7feb795a3a97e8395008
https://seclists.org/oss-sec/2017/q1/52
https://security-tracker.debian.org/tracker/CVE-2016-7056