CVE-2026-50266

Name	CVE-2026-50266
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).
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6340-1
Debian Bugs	1138844

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
neutron (PTS)	bullseye (security), bullseye	2:17.2.1-0+deb11u1	fixed
	bookworm	2:21.0.0-7	fixed
	trixie	2:26.0.0-9	vulnerable
	trixie (security)	2:26.0.3-0+deb13u2	fixed
	forky	2:27.0.1-6	vulnerable
	sid	2:28.0.0-8	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
neutron	source	bullseye	(not affected)
neutron	source	bookworm	(not affected)
neutron	source	trixie	2:26.0.3-0+deb13u2	DSA-6340-1
neutron	source	(unstable)	2:28.0.0-7		1138844

Notes

[bookworm] - neutron <not-affected> (Vulnerable code not present)
[bullseye] - neutron <not-affected> (Vulnerable code not present)
https://www.openwall.com/lists/oss-security/2026/06/04/6
https://security.openstack.org/ossa/OSSA-2026-021.html
https://launchpad.net/bugs/2152115