CVE-2026-75131

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.

Affected Software

Weaknesses

• CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/nm-l2tp/NetworkManager-l2tp/security/advisories/GHSA-v2wj-xr2m-xc4j

References

• https://github.com/nm-l2tp/NetworkManager-l2tp/security/advisories/GHSA-v2wj-xr2m-xc4j
• https://www.vulncheck.com/advisories/networkmanager-l2tp-privilege-escalation-via-pppd-username-injection

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