CVE-2026-19624
NetworkManager-l2tp: local privilege escalation via ipsec.conf injection
- State
- Published
- Severity
- 7.8 High
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Reserved
- Aug 12, 2026
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | fedora |
Weaknesses
- CWE-88 Improper Control of an Argument of a Program Call ('Argument Injection')
Affected Products
| Product | Versions |
|---|---|
NetworkManager-l2tp |
|
FedoraFedora |
|
Extra Packages for Enterprise Linux (EPEL)Fedora |
|
References
- https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91cpatch
- https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673patch
- https://github.com/nm-l2tp/NetworkManager-l2tp/releasesrelease-notes
- https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tpvendor-advisory
- https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/third-party-advisory
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