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CVE-2026-93337

CVE-2026-93337 · NetworkManager-l2tp Privilege Escalation via pppd Plugin 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 an improper input validation vulnerability that allows local users with VPN connection creation permissions to inject arbitrary pppd directives by supplying mru or mtu property values containing trailing non-numeric content after a valid integer. Attackers can exploit the verbatim write of unvalidated strings into the pppd options file via write_config_option() to inject the plugin directive, causing the privileged pppd process to load an attacker-controlled shared object and achieve arbitrary code execution as root.

CVSS 8.5 · High · EPSS 0.1% · 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:26.04:LTS

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

    No fix published

Original sources

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