OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks
In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has "network:" at the beginning ("network:dhcp" for example). The default port RBAC policies incorrectly included PROJECT_MANAGER without requiring network ownership, allowing any project manager to obtain trusted network-service port behavior on shared networks. Depending on backend and deployment, this can bypass anti-spoofing and security group protections, enabling DHCP, MAC, or IP spoofing against other tenants on the shared network. This is a regression of CVE-2015-5240 (OSSA-2015-018).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-50266US | —OT elevated | — | ||
In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has "network:" a… | ||||
references
External citations — patches, advisories, analysis.
- https://bugs.launchpad.net/neutron/+bug/2152115WEB
- https://github.com/openstack/neutronPACKAGE
- https://launchpad.net/bugs/2152115WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-50266ADVISORY
- https://review.opendev.org/990273WEB
- https://review.opendev.org/990353WEB
- https://review.opendev.org/990356WEB
- https://www.openwall.com/lists/oss-security/2026/06/04/6WEB
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