msrc_cve-2025-21759
Vulnerability from csaf_microsoft
Published
2025-02-02 00:00
Modified
2025-04-09 00:00
Summary
ipv6: mcast: extend RCU protection in igmp6_send()

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
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.


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{
  "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-2025-21759 ipv6: mcast: extend RCU protection in igmp6_send() - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-21759.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": "ipv6: mcast: extend RCU protection in igmp6_send()",
    "tracking": {
      "current_release_date": "2025-04-09T00:00:00.000Z",
      "generator": {
        "date": "2025-10-20T02:58:28.827Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2025-21759",
      "initial_release_date": "2025-02-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2025-04-09T00:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "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 kernel 5.15.186.1-1",
                "product": {
                  "name": "cbl2 kernel 5.15.186.1-1",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003cazl3 kernel 6.6.78.1-3",
                "product": {
                  "name": "\u003cazl3 kernel 6.6.78.1-3",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 kernel 6.6.78.1-3",
                "product": {
                  "name": "azl3 kernel 6.6.78.1-3",
                  "product_id": "17471"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003cazl3 kernel 6.6.82.1-1",
                "product": {
                  "name": "\u003cazl3 kernel 6.6.82.1-1",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 kernel 6.6.82.1-1",
                "product": {
                  "name": "azl3 kernel 6.6.82.1-1",
                  "product_id": "17465"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 kernel 5.15.186.1-1 as a component of CBL Mariner 2.0",
          "product_id": "17086-3"
        },
        "product_reference": "3",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "\u003cazl3 kernel 6.6.78.1-3 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": "azl3 kernel 6.6.78.1-3 as a component of Azure Linux 3.0",
          "product_id": "17471-17084"
        },
        "product_reference": "17471",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "\u003cazl3 kernel 6.6.82.1-1 as a component of Azure Linux 3.0",
          "product_id": "17084-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 6.6.82.1-1 as a component of Azure Linux 3.0",
          "product_id": "17465-17084"
        },
        "product_reference": "17465",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-21759",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "17471-17084",
          "17465-17084"
        ],
        "known_affected": [
          "17086-3",
          "17084-1",
          "17084-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-21759 ipv6: mcast: extend RCU protection in igmp6_send() - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-21759.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-04-09T00:00:00.000Z",
          "details": "6.6.82.1-1:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-1",
            "17084-2"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 7.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "17086-3",
            "17084-1",
            "17084-2"
          ]
        }
      ],
      "title": "ipv6: mcast: extend RCU protection in igmp6_send()"
    }
  ]
}


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