{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-4105 Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-4105.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method",
    "tracking": {
      "current_release_date": "2026-04-01T14:36:30.000Z",
      "generator": {
        "date": "2026-06-09T07:21:41.527Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-4105",
      "initial_release_date": "2026-03-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-03-17T01:02:38.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-03-31T14:48:53.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-04-01T14:36:30.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "2.0",
                "product": {
                  "name": "CBL Mariner 2.0",
                  "product_id": "17086"
                }
              },
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "cbl2 systemd 0:250.3-23.cbl2",
                "product": {
                  "name": "cbl2 systemd 0:250.3-23.cbl2",
                  "product_id": "5"
                }
              },
              {
                "category": "product_version_range",
                "name": "cbl2 systemd 0:250.3-24.cbl2",
                "product": {
                  "name": "cbl2 systemd 0:250.3-24.cbl2",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version_range",
                "name": "azl3 systemd 0:255-26.azl3",
                "product": {
                  "name": "azl3 systemd 0:255-26.azl3",
                  "product_id": "4"
                }
              }
            ],
            "category": "product_name",
            "name": "systemd"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 systemd-bootstrap 0:250.3-19.azl3",
                "product": {
                  "name": "azl3 systemd-bootstrap 0:250.3-19.azl3",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version_range",
                "name": "cbl2 systemd-bootstrap 0:250.3-13.cbl2",
                "product": {
                  "name": "cbl2 systemd-bootstrap 0:250.3-13.cbl2",
                  "product_id": "7"
                }
              },
              {
                "category": "product_version_range",
                "name": "azl3 systemd-bootstrap 0:250.3-18.azl3",
                "product": {
                  "name": "azl3 systemd-bootstrap 0:250.3-18.azl3",
                  "product_id": "6"
                }
              },
              {
                "category": "product_version_range",
                "name": "cbl2 systemd-bootstrap 0:250.3-14.cbl2",
                "product": {
                  "name": "cbl2 systemd-bootstrap 0:250.3-14.cbl2",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "systemd-bootstrap"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 systemd 0:250.3-23.cbl2 as a component of CBL Mariner 2.0",
          "product_id": "17086-5"
        },
        "product_reference": "5",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 systemd 0:250.3-24.cbl2 as a component of CBL Mariner 2.0",
          "product_id": "17086-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 systemd-bootstrap 0:250.3-19.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 systemd-bootstrap 0:250.3-13.cbl2 as a component of CBL Mariner 2.0",
          "product_id": "17086-7"
        },
        "product_reference": "7",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 systemd 0:255-26.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-4"
        },
        "product_reference": "4",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 systemd-bootstrap 0:250.3-18.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-6"
        },
        "product_reference": "6",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 systemd-bootstrap 0:250.3-14.cbl2 as a component of CBL Mariner 2.0",
          "product_id": "17086-3"
        },
        "product_reference": "3",
        "relates_to_product_reference": "17086"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-4105",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "notes": [
        {
          "category": "general",
          "text": "redhat",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17086-5",
          "17086-2",
          "17084-1",
          "17086-7",
          "17084-4",
          "17084-6",
          "17086-3"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-4105 Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-4105.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-5"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-2"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-7"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-4"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-6"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-03-17T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-3"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 6.7,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "17086-5",
            "17086-2",
            "17084-1",
            "17086-7",
            "17084-4",
            "17084-6",
            "17086-3"
          ]
        }
      ],
      "title": "Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method"
    }
  ]
}