Description
In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets. An authenticated user can onboard subnets from another project's shared network into their own subnetpool, mutating the victim's subnet state and altering L3 routing and address scope behavior for victim routers.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenStack | Neutron | 14.0.0 – < 26.0.6, 27.0.0 – < 27.0.4, 28.0.0 – < 28.0.2 | 26.0.6 |
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 | 2:28.0.1-2 | — |
| Debian 13 | neutron | 2:26.0.3-0+deb13u3 | — |
| Debian 12 | neutron | 2:21.0.0-7+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | neutron | No fix yet | — |
| Ubuntu 26.04 LTS | neutron | No fix yet | — |
| Ubuntu 24.04 LTS | neutron | No fix yet | — |
| Ubuntu 22.04 LTS | neutron | No fix yet | — |
| Ubuntu 20.04 LTS | neutron | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | neutron | No fix yet | — |
| Ubuntu 16.04 LTS | neutron | No fix yet | — |
Advisories 1
- WID-SEC-2026-2577 Red Hat OpenStack (Neutron): Schwachstelle ermöglicht Manipulation von Daten und Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Aug 16, 2026
References
- https://launchpad.net/bugs/2152113 issue-tracking
- https://security.openstack.org/ossa/OSSA-2026-032.html vendor-advisory
- https://www.openwall.com/lists/oss-security/2026/07/29/5 vendor-advisory mailing-list