CVE-2026-75131

HIGH 7.8

NetworkManager-l2tp Privilege Escalation via pppd Username Injection

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-88
Vendor	nm-l2tp
Product	networkmanager-l2tp
Published	Sep 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

nm-l2tp / NetworkManager-l2tp

0 ≤ 1.52.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nm-l2tp/NetworkManager-l2tp/security/advisories/GHSA-v2wj-xr2m-xc4j vulncheck.com: https://www.vulncheck.com/advisories/networkmanager-l2tp-privilege-escalation-via-pppd-username-injection

Credits

Andres Berbescu (4drez)