Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-os-vif | 1.15.2-1 | — |
| Debian 13 | python-os-vif | 1.15.2-1 | — |
| Debian 12 | python-os-vif | 1.15.2-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | python-os-vif | No fix yet | — |
| Ubuntu 20.04 LTS | python-os-vif | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | os-vif | >= 1.15.0, < 1.15.2 | 1.15.2 | GHSA-mcpw-cp35-p3h8 |
| PyPI | os-vif | >= 1.16.0, < 1.17.0 | 1.17.0 | GHSA-mcpw-cp35-p3h8 |
| PyPI | os-vif | >= 1.15.0, < 1.15.2 · >= 1.16.0, < 1.17.0 | 1.15.2, 1.17.0 | PYSEC-2026-440 |