Description

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).

Weaknesses 1

References 6

• bugs.launchpad.net https://bugs.launchpad.net/neutron/+bug/2152115
• launchpad.net https://launchpad.net/bugs/2152115
• review.opendev.org https://review.opendev.org/990273
• review.opendev.org https://review.opendev.org/990353
• review.opendev.org https://review.opendev.org/990356
• openwall.com https://www.openwall.com/lists/oss-security/2026/06/04/6

Remediation