Vulnerability-Lookup

UBUNTU-CVE-2026-75883 (CVE-2026-75883)

Vulnerability from osv_ubuntu – Published: 2026-09-18 16:17 – Updated: 2026-09-23 23:35 – Source website

Details

The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to a server which requests PEAP authentication can be induced to corrupt global static data following the outpacket_buf array, most likely causing incorrect behavior or a crash.

Severity

6.8 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-75883	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-75883	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": "The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf  without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to a server which requests PEAP authentication can be induced to corrupt global static data following the outpacket_buf array, most likely causing incorrect behavior or a crash.",
  "id": "UBUNTU-CVE-2026-75883",
  "modified": "2026-09-23T23:35:43Z",
  "published": "2026-09-18T16:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-75883"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-75883"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-75883"
  ]
}

CVE-2026-75883 (GCVE-0-2026-75883)

Vulnerability from cvelistv5 – Published: 2026-09-18 15:29 – Updated: 2026-09-22 14:43

Title

PPPD buffer overflow in PEAP response code

Summary

Severity

6.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 14:43 UTC

CWE

CWE-122 - Heap-based buffer overflow

Assigner

redhat redhat root Scorecard

References

1 reference

URL	Tags
https://github.com/ppp-project/ppp/security/advis…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
PPP Project	ppp	Affected: 0 , ≤ 2.5.0 (semver) Unaffected: 2.5.4 (semver)

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-75883",
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                    "Technical Impact": "total"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-22T14:43:07.472707Z",
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          "repo": "https://github.com/interchange/interchange/",
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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.
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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UBUNTU-CVE-2026-75883 (CVE-2026-75883)

CVE-2026-75883 (GCVE-0-2026-75883)

Tags

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