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CVE-2026-75131

CVE-2026-75131 · NetworkManager-l2tp Privilege Escalation via pppd Username Injection

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.5 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • networkmanager-l2tp

    Versions
    • ≥ 0, ≤ 1.52.4: Affected (semver)
    • 1.52.6: Not affected (semver)

    Update to 1.52.6

  • network-manager-l2tp Debian:12

    Versions
    • 1.20.8-1
    Affected ranges
    • ECOSYSTEM: < 1.20.8-1+deb12u1

    Update to 1.20.8-1+deb12u1

  • network-manager-l2tp Debian:13

    Versions
    • 1.20.20-2
    Affected ranges
    • ECOSYSTEM: < 1.20.20-2+deb13u1

    Update to 1.20.20-2+deb13u1

  • network-manager-l2tp Debian:14

    Versions
    • 1.20.20-2
    • 1.52.0-1
    • 1.52.0-2
    • 1.52.2-1
    • 1.52.4-1
    Affected ranges
    • ECOSYSTEM: < 1.52.6-1

    Update to 1.52.6-1

  • network-manager-l2tp Ubuntu:18.04:LTS

    Versions
    • 1.2.8-1
    • 1.2.8-2build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • network-manager-l2tp Ubuntu:20.04:LTS

    Versions
    • 1.2.10-1
    • 1.2.14-1
    • 1.2.16-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • network-manager-l2tp Ubuntu:22.04:LTS

    Versions
    • 1.2.18-1build1
    • 1.20.0-1
    • 1.20.0-1build1
    • 1.20.0-1build2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • network-manager-l2tp Ubuntu:24.04:LTS

    Versions
    • 1.20.8-1
    • 1.20.10-1
    • 1.20.12-1
    • 1.20.12-1build1
    • 1.20.12-1build2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • network-manager-l2tp Ubuntu:26.10

    Versions
    • 1.52.0-2
    • 1.52.2-1
    • 1.52.4-1
    • 1.52.4-1build1
    • 1.52.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • network-manager-l2tp Ubuntu:26.04:LTS

    Versions
    • 1.20.20-2
    • 1.52.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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