TI-2026-52786 Aliases CVE-2026-75131

NetworkManager-l2tp Privilege Escalation via pppd Username Injection

HIGH 72CWE-88Published 2026-09-23 · Updated 2026-09-23

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00178 7th percentileScored 2026-11-07

Fix Fixed NetworkManager-l2tp (nm-l2tp): 1.52.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nm-l2tp	NetworkManager-l2tp	up to 1.52.4	1.52.6	Patch available	CNA

NetworkManager-l2tp Vendornm-l2tp Affected up to 1.52.4 Fixed in 1.52.6 Patch available CNA

Remediation

Fix · CNA NetworkManager-l2tp (nm-l2tp) Fixed in 1.52.6

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-75131

References

Advisory 1

GitHub Security Advisory (GHSA-v2wj-xr2m-xc4j)

TI-2026-62929 NetworkManager-l2tp Privilege Escalation via pppd Plugin Injection CVSS 4.0HIGH 8.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences