Vulnerability-Lookup

ubuntu-cve-2026-43916

Vulnerability from osv_ubuntu

Published

2026-05-13 00:00

Modified

2026-05-13 00:00

Summary

Details

(pam_authnft is a PAM session module binding nftables firewall rules to ...)

Severity

8.7 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-43916	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-43916	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-cracklib",
            "binary_version": "1.1.8-1ubuntu2.2+esm4"
          },
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.1.8-1ubuntu2.2+esm4"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.1.8-1ubuntu2.2+esm4"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.1.8-1ubuntu2.2+esm4"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.1.8-1ubuntu2.2+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.1.8-1ubuntu2.2+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.3-8ubuntu3",
        "1.1.3-10ubuntu1",
        "1.1.3-11ubuntu1",
        "1.1.8-1ubuntu1",
        "1.1.8-1ubuntu2",
        "1.1.8-1ubuntu2.1",
        "1.1.8-1ubuntu2.2",
        "1.1.8-1ubuntu2.2+esm1",
        "1.1.8-1ubuntu2.2+esm3",
        "1.1.8-1ubuntu2.2+esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-cracklib",
            "binary_version": "1.1.8-3.2ubuntu2.3+esm5"
          },
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.1.8-3.2ubuntu2.3+esm5"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.1.8-3.2ubuntu2.3+esm5"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.1.8-3.2ubuntu2.3+esm5"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.1.8-3.2ubuntu2.3+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.1.8-3.2ubuntu2.3+esm5?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.8-3.1ubuntu3",
        "1.1.8-3.2ubuntu2",
        "1.1.8-3.2ubuntu2.1",
        "1.1.8-3.2ubuntu2.3",
        "1.1.8-3.2ubuntu2.3+esm1",
        "1.1.8-3.2ubuntu2.3+esm2",
        "1.1.8-3.2ubuntu2.3+esm4",
        "1.1.8-3.2ubuntu2.3+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-cracklib",
            "binary_version": "1.1.8-3.6ubuntu2.18.04.6+esm1"
          },
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.1.8-3.6ubuntu2.18.04.6+esm1"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.1.8-3.6ubuntu2.18.04.6+esm1"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.1.8-3.6ubuntu2.18.04.6+esm1"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.1.8-3.6ubuntu2.18.04.6+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.1.8-3.6ubuntu2.18.04.6+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.8-3.2ubuntu3",
        "1.1.8-3.2ubuntu4",
        "1.1.8-3.6ubuntu1",
        "1.1.8-3.6ubuntu2",
        "1.1.8-3.6ubuntu2.18.04.1",
        "1.1.8-3.6ubuntu2.18.04.2",
        "1.1.8-3.6ubuntu2.18.04.3",
        "1.1.8-3.6ubuntu2.18.04.4",
        "1.1.8-3.6ubuntu2.18.04.6",
        "1.1.8-3.6ubuntu2.18.04.6+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-cracklib",
            "binary_version": "1.3.1-5ubuntu4.7"
          },
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.3.1-5ubuntu4.7"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.3.1-5ubuntu4.7"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.3.1-5ubuntu4.7"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.3.1-5ubuntu4.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.3.1-5ubuntu4.7?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.1-5ubuntu1",
        "1.3.1-5ubuntu3",
        "1.3.1-5ubuntu4",
        "1.3.1-5ubuntu4.1",
        "1.3.1-5ubuntu4.2",
        "1.3.1-5ubuntu4.3",
        "1.3.1-5ubuntu4.4",
        "1.3.1-5ubuntu4.6",
        "1.3.1-5ubuntu4.7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-cracklib",
            "binary_version": "1.4.0-11ubuntu2.6"
          },
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.4.0-11ubuntu2.6"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.4.0-11ubuntu2.6"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.4.0-11ubuntu2.6"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.4.0-11ubuntu2.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.4.0-11ubuntu2.6?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.1-5ubuntu11",
        "1.4.0-10ubuntu1",
        "1.4.0-10ubuntu2",
        "1.4.0-11ubuntu1",
        "1.4.0-11ubuntu2",
        "1.4.0-11ubuntu2.1",
        "1.4.0-11ubuntu2.3",
        "1.4.0-11ubuntu2.4",
        "1.4.0-11ubuntu2.5",
        "1.4.0-11ubuntu2.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.5.3-5ubuntu5.5"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.5.3-5ubuntu5.5"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.5.3-5ubuntu5.5"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.5.3-5ubuntu5.5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.5.3-5ubuntu5.5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.2-6ubuntu1",
        "1.5.2-9.1ubuntu1",
        "1.5.2-9.1ubuntu2",
        "1.5.2-9.1ubuntu3",
        "1.5.3-5ubuntu3",
        "1.5.3-5ubuntu4",
        "1.5.3-5ubuntu5",
        "1.5.3-5ubuntu5.1",
        "1.5.3-5ubuntu5.4",
        "1.5.3-5ubuntu5.5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.7.0-5ubuntu2"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.7.0-5ubuntu2"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.7.0-5ubuntu2"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.7.0-5ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.7.0-5ubuntu2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.3-7ubuntu4",
        "1.5.3-7ubuntu5",
        "1.5.3-7ubuntu6",
        "1.7.0-5ubuntu1",
        "1.7.0-5ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpam-modules",
            "binary_version": "1.7.0-5ubuntu3"
          },
          {
            "binary_name": "libpam-modules-bin",
            "binary_version": "1.7.0-5ubuntu3"
          },
          {
            "binary_name": "libpam-runtime",
            "binary_version": "1.7.0-5ubuntu3"
          },
          {
            "binary_name": "libpam0g",
            "binary_version": "1.7.0-5ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04",
        "name": "pam",
        "purl": "pkg:deb/ubuntu/pam@1.7.0-5ubuntu3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.0-5ubuntu2",
        "1.7.0-5ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "(pam_authnft is a PAM session module binding nftables firewall rules to ...)",
  "id": "UBUNTU-CVE-2026-43916",
  "modified": "2026-05-13T00:00:00Z",
  "published": "2026-05-13T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43916"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43916"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-43916"
  ],
  "withdrawn": "2026-05-20T15:28:57Z"
}

CVE-2026-43916 (GCVE-0-2026-43916)

Vulnerability from cvelistv5 – Published: 2026-05-12 13:31 – Updated: 2026-05-13 14:38

Title

pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker

Summary

pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-191 - Integer Underflow (Wrap or Wraparound)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/identd-ng/pam_authnft/security…	x_refsource_CONFIRM
https://github.com/identd-ng/pam_authnft/pull/10	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
identd-ng	pam_authnft	Affected: < 0.2.0-alpha

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-43916",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T14:32:22.591683Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T14:38:34.899Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pam_authnft",
          "vendor": "identd-ng",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.2.0-alpha"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-191",
              "description": "CWE-191: Integer Underflow (Wrap or Wraparound)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-12T13:31:44.359Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh"
        },
        {
          "name": "https://github.com/identd-ng/pam_authnft/pull/10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/identd-ng/pam_authnft/pull/10"
        }
      ],
      "source": {
        "advisory": "GHSA-5jj5-hm34-78vh",
        "discovery": "UNKNOWN"
      },
      "title": "pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-43916",
    "datePublished": "2026-05-12T13:31:44.359Z",
    "dateReserved": "2026-05-04T16:11:33.086Z",
    "dateUpdated": "2026-05-13T14:38:34.899Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

ubuntu-cve-2026-43916

Vulnerability from osv_ubuntu

CVE-2026-43916 (GCVE-0-2026-43916)

Tags

Sightings

Nomenclature