Description
OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.
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 | neutron | 2:18.1.0-2 | — |
| Debian 13 | neutron | 2:18.1.0-2 | — |
| Debian 12 | neutron | 2:18.1.0-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | neutron | 2:20.3.0-0ubuntu1.1 | USN-6067-1 |
| Ubuntu 20.04 LTS | neutron | 2:16.4.2-0ubuntu6.2 | USN-6067-1 |
| Ubuntu 18.04 LTS | neutron | 2:12.1.1-0ubuntu8.1 | USN-6067-1 |
| Ubuntu 16.04 LTS | neutron | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | neutron | < 16.4.1 | 16.4.1 | GHSA-hvm4-mc7m-22w4 |
| PyPI | neutron | >= 17.0.0, < 17.1.3 | 17.1.3 | GHSA-hvm4-mc7m-22w4 |
| PyPI | neutron | 18.0.0 | — | GHSA-hvm4-mc7m-22w4 |
| PyPI | neutron | < 16.4.1 · >= 17.0.0, < 17.1.3 · >= 18.0.0, < 18.1.0 | 16.4.1, 17.1.3, 18.1.0 | PYSEC-2021-360 |
Advisories 1
- USN-6067-1 neutron vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026