Vulnerability · Published Sep 23, 2026 · Assigned by VulnCheck
CVE-2026-75131NetworkManager-l2tp Privilege Escalation via pppd Username Injection
High 7.8
In plain English
A high-severity argument injection in NetworkManager-l2tp from nm-l2tp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
NetworkManager-l2tp through 1.52.4, fixed in 1.52.6, contains a privilege escalation vulnerability that allows local users with permission to create VPN connections to execute arbitrary code as root by injecting pppd options through a crafted VPN username. Attackers can embed a double-quote character or whitespace in the username to break out of the pppd options file quoting context and include the pppd plugin directive, causing the privileged pppd process to load an attacker-controlled shared object.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | network-manager-l2tp | 1.20.8-1+deb12u1 | DEBIAN-CVE-2026-75131 |
| Debian:13 | network-manager-l2tp | 1.20.20-2+deb13u1 | DEBIAN-CVE-2026-75131 |
| Debian:14 | network-manager-l2tp | 1.52.6-1 | DEBIAN-CVE-2026-75131 |
| Ubuntu:22.04:LTS | network-manager-l2tp | no fix listed | UBUNTU-CVE-2026-75131 |
| Ubuntu:24.04:LTS | network-manager-l2tp | no fix listed | UBUNTU-CVE-2026-75131 |
| Ubuntu:26.04:LTS | network-manager-l2tp | no fix listed | UBUNTU-CVE-2026-75131 |
| Ubuntu:26.10 | network-manager-l2tp | no fix listed | UBUNTU-CVE-2026-75131 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nm-l2tp | NetworkManager-l2tp | 0 – through 1.52.4 |
Weakness: CWE-88 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H