We’ve encountered this problem on our Rackspace cloud servers, and taking inspiration from http://www.unixmen.com/rhel-centos-6-4- … 14-update/ we have a workaround which seems to be working for yum and curl via WordPress/PHP/Apache.
Created /etc/profile.d/nss.sh and added:
export NSS_DISABLE_HW_AES=1
Add the following to /etc/grub.conf:
systemd.setenv=NSS_DISABLE_HW_AES=1
Added the following to /etc/sysconfig/init:
export NSS_DISABLE_HW_AES=1