CVE-2019-15753

In OpenStack os-vif 1.15.x before 1.15.2, and 1.16.0, a hard-coded MAC
aging time of 0 disables MAC learning in linuxbridge, forcing obligatory
Ethernet flooding of non-local destinations, which both impedes network
performance and allows users to possibly view the content of packets for
instances belonging to other tenants sharing the same network. Only
deployments using the linuxbridge backend are affected. This occurs in
PyRoute2.add() in internal/command/ip/linux/impl_pyroute2.py.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=939288&gt;
• <https://launchpad.net/bugs/1837252&gt;

Notes