Lxc · Lxc · CVE-2026-39402
**Name of the Vulnerable Software and Affected Versions**
lxc versions prior to 7.0.0
**Description**
A logic flaw in the `find line()` function of the `lxc-user-nic` setuid helper allows an unprivileged user to delete OVS-attached network interfaces belonging to other users. When scanning the NIC database to authorize a deletion request, the interface name comparison may set the authorization flag based solely on a name match, ignoring ownership, type, and link fields. This occurs because the check is reachable after the `goto next` label handling, and subsequent processes do not re-verify that the matched entry belongs to the caller. In multi-tenant environments using OpenVSwitch bridges, an attacker with a valid `lxc-usernet` policy entry can trigger the deletion of another user's OVS port on the same bridge, resulting in a denial of service by repeatedly disconnecting networking from other tenants' containers.
**Recommendations**
Update to version 7.0.0.