Vulnerability-Lookup

CVE-2026-19624 (GCVE-0-2026-19624)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:19 – Updated: 2026-09-14 19:43

Title

NetworkManager-l2tp: local privilege escalation via ipsec.conf injection

Summary

A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:43 UTC

CWE

CWE-88 - Improper Control of an Argument of a Program Call ('Argument Injection')

Assigner

fedora redhat root

References

5 references

URL	Tags
https://github.com/nm-l2tp/NetworkManager-l2tp/co…	patch
https://github.com/nm-l2tp/NetworkManager-l2tp/co…	patch
https://github.com/nm-l2tp/NetworkManager-l2tp/releases	release-notes
https://bodhi.fedoraproject.org/updates/?packages…	vendor-advisory
https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/	third-party-advisory

Impacted products

3 products

Vendor	Product	Version	CPE status
		Affected: 1.0.0 , < 1.0.16 (semver) Affected: 1.2.0 , < 1.2.22 (semver) Affected: 1.8.0 , < 1.8.10 (semver) Affected: 1.20.0 , < 1.20.24 (semver) Affected: 1.52.0 , < 1.52.4 (semver)
Fedora	Fedora	Affected: 1.52.0 , < 1.52.4 (semver)	guessed
Fedora	Extra Packages for Enterprise Linux (EPEL)	Affected: 1.20.0 , < 1.20.24 (semver)	guessed

Date Public

2026-09-03 00:00

Credits

Keith Linneman (Linneman Labs)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-19624

Vulnerability from fkie_nvd - Published: 2026-09-14 20:16 - Updated: 2026-09-14 20:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	patrick@puiterwijk.org	https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp
	patrick@puiterwijk.org	https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673
	patrick@puiterwijk.org	https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c
	patrick@puiterwijk.org	https://github.com/nm-l2tp/NetworkManager-l2tp/releases
	patrick@puiterwijk.org	https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/releases"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/"
    }
  ],
  "sourceIdentifier": "patrick@puiterwijk.org",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-88"
        }
      ],
      "source": "patrick@puiterwijk.org",
      "type": "Secondary"
    }
  ]
}

GHSA-4533-C5F5-J3H9

Vulnerability from github – Published: 2026-09-14 21:31 – Updated: 2026-09-14 21:31

Details

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-19624"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-88"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T20:16:43Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).",
  "id": "GHSA-4533-c5f5-j3h9",
  "modified": "2026-09-14T21:31:45Z",
  "published": "2026-09-14T21:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19624"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c"
    },
    {
      "type": "WEB",
      "url": "https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/releases"
    },
    {
      "type": "WEB",
      "url": "https://linnemanlabs.com/posts/nm-l2tp-newline-to-root"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-19624

Vulnerability from osv_ubuntu

Published

2026-09-15 00:00

Modified

2026-09-15 00:00

Summary

Details

security update

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-19624	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-19624	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-l2tp",
            "binary_version": "1.2.8-2build1"
          },
          {
            "binary_name": "network-manager-l2tp-gnome",
            "binary_version": "1.2.8-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "network-manager-l2tp",
        "purl": "pkg:deb/ubuntu/network-manager-l2tp@1.2.8-2build1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.8-1",
        "1.2.8-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-l2tp",
            "binary_version": "1.2.16-1"
          },
          {
            "binary_name": "network-manager-l2tp-gnome",
            "binary_version": "1.2.16-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "network-manager-l2tp",
        "purl": "pkg:deb/ubuntu/network-manager-l2tp@1.2.16-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.10-1",
        "1.2.14-1",
        "1.2.16-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-l2tp",
            "binary_version": "1.20.0-1build2"
          },
          {
            "binary_name": "network-manager-l2tp-gnome",
            "binary_version": "1.20.0-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "network-manager-l2tp",
        "purl": "pkg:deb/ubuntu/network-manager-l2tp@1.20.0-1build2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.18-1build1",
        "1.20.0-1",
        "1.20.0-1build1",
        "1.20.0-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-l2tp",
            "binary_version": "1.20.12-1build2"
          },
          {
            "binary_name": "network-manager-l2tp-gnome",
            "binary_version": "1.20.12-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "network-manager-l2tp",
        "purl": "pkg:deb/ubuntu/network-manager-l2tp@1.20.12-1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.20.8-1",
        "1.20.10-1",
        "1.20.12-1",
        "1.20.12-1build1",
        "1.20.12-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-l2tp",
            "binary_version": "1.52.0-2"
          },
          {
            "binary_name": "network-manager-l2tp-gnome",
            "binary_version": "1.52.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "network-manager-l2tp",
        "purl": "pkg:deb/ubuntu/network-manager-l2tp@1.52.0-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.20.20-2",
        "1.52.0-2"
      ]
    }
  ],
  "aliases": [],
  "details": "security update",
  "id": "UBUNTU-CVE-2026-19624",
  "modified": "2026-09-15T00:00:00Z",
  "published": "2026-09-15T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19624"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-19624"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-19624"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-19624 (GCVE-0-2026-19624)

FKIE_CVE-2026-19624

GHSA-4533-C5F5-J3H9

ubuntu-cve-2026-19624

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature