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Start learningUpgrade RHEL:7 libvirt-daemon-driver-network to version 0:2.0.0-10.el7 or higher.
This issue was patched in RHSA-2016:2577.
Note: Versions mentioned in the description apply only to the upstream libvirt-daemon-driver-network package and not the libvirt-daemon-driver-network package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
libvirt before 2.2 includes Ceph credentials on the qemu command line when using RADOS Block Device (aka RBD), which allows local users to obtain sensitive information via a process listing.