Description
A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| — | — | >= 1.0.0, < 1.0.16; >= 1.2.0, < 1.2.22; >= 1.8.0, < 1.8.10; >= 1.20.0, < 1.20.24; >= 1.52.0, < 1.52.4 |
| Fedora | Fedora | >= 1.52.0, < 1.52.4 |
| Fedora | Extra Packages for Enterprise Linux (EPEL) | >= 1.20.0, < 1.20.24 |
References
- https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp
- https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673
- https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c
- https://github.com/nm-l2tp/NetworkManager-l2tp/releases
- https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/
Timeline
- Published
- Sep 14, 2026
- Last modified
- Sep 18, 2026
- NVD status
- Awaiting Analysis