The gnutls packages provide the GNU Transport Layer Security library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS. The following packages have been upgraded to a later upstream version: gnutls . Security Fix: * gnutls: HMAC-SHA-256 vulnerable to Lucky thirteen attack due to not enough dummy function calls * gnutls: HMAC-SHA-384 vulnerable to Lucky thirteen attack due to use of wrong constant * gnutls: Just in Time PRIME + PROBE cache-based side channel attack can lead to plaintext recovery For more details about the security issue, including the impact, a CVSS score, and other related information, refer to the CVE page listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.