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CVE-2026-75131

NetworkManager-l2tp Privilege Escalation via pppd Username Injection

CVSS 4.0 8.5 HIGHCVSS 3.1 7.8 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-75131

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-75131

Published

NetworkManager-l2tp

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "vendor": "nm-l2tp",
                    "product": "NetworkManager-l2tp",
                    "packageURL": "pkg:github/nm-l2tp/NetworkManager-l2tp",
                    "repo": "https://github.com/nm-l2tp/NetworkManager-l2tp",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver",
                            "lessThanOrEqual": "1.52.4"
                        },
                        {
                            "status": "unaffected",
                            "version": "1.52.6",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON