Description
A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | openstack-neutron | openstack-neutron 15.3.3, openstack-neutron 16.3.1, openstack-neutron 17.1.1 | — |
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 | 2:17.1.1-5 | — |
| Debian 13 | neutron | 2:17.1.1-5 | — |
| Debian 12 | neutron | 2:17.1.1-5 | — |
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 | >= 16.0.0, < 16.3.1 | 16.3.1 | GHSA-w8hx-f868-pvch |
| PyPI | neutron | < 15.3.3 | 15.3.3 | GHSA-w8hx-f868-pvch |
| PyPI | neutron | >= 17.0.0, < 17.1.1 | 17.1.1 | GHSA-w8hx-f868-pvch |
| PyPI | neutron | < 15.3.3 · >= 16.0.0, < 16.3.1 · >= 17.0.0, < 17.1.1 | 15.3.3, 16.3.1, 17.1.1 | PYSEC-2021-136 |
Advisories 1
- USN-6067-1 neutron vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026