D-Bus is a message bus system which processes can use to talk to each other.
D-Bus does not correctly dispose of old connections meaning that it is possible for D-Bus to hit a connection limit.
An attacker could cause a possible Denial of Service condition.
There is no known workaround at this time.
All D-Bus users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/dbus-1.12.18"