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).
Problem types
CWE-863 Incorrect Authorization
Product status
25.0.0 (semver) before 25.2.4
26.0.0 (semver) before 26.0.4
27.0.0 (semver) before 27.0.3
28.0.0 (semver) before 28.0.1
References
launchpad.net/bugs/2152115
review.opendev.org/990273
review.opendev.org/990353
review.opendev.org/990356
www.openwall.com/lists/oss-security/2026/06/04/6
