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.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
nm-l2tp NetworkManager-l2tp unaffected
Version Status Constraints
0 affected ≤ 1.52.4
1.52.6 unaffected —

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Project Subscriptions

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6498-1 network-manager-l2tp security update
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Wed, 23 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 23 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title NetworkManager-l2tp Privilege Escalation via pppd Username Injection
Weaknesses CWE-88
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-23T19:39:31.114Z

Reserved: 2026-08-17T18:39:57.661Z

Link: CVE-2026-75131

cve-icon Vulnrichment

Updated: 2026-09-23T19:38:38.659Z

cve-icon NVD

Status : Received

Published: 2026-09-23T19:19:14.073

Modified: 2026-09-23T20:17:14.513

Link: CVE-2026-75131

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T20:00:08Z

Weaknesses