{
  "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-2026-98881 net: bridge: remove stale rcu_barrier() in br_multicast_dev_del() - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98881.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": "net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()",
    "tracking": {
      "current_release_date": "2026-11-02T01:46:54.000Z",
      "generator": {
        "date": "2026-11-04T08:01:21.796Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-98881",
      "initial_release_date": "2026-10-24T01:03:39.000Z",
      "revision_history": [
        {
          "date": "2026-10-24T01:03:39.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-10-24T01:05:04.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-10-24T14:45:43.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        },
        {
          "date": "2026-11-02T01:46:54.000Z",
          "legacy_version": "4",
          "number": "4",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "4.0",
                "product": {
                  "name": "Azure Linux 4.0",
                  "product_id": "22078"
                }
              },
              {
                "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": "<azl3 kernel 0:6.6.157.1-1.azl3",
                "product": {
                  "name": "<azl3 kernel 0:6.6.157.1-1.azl3",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 kernel 0:6.6.157.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.157.1-1.azl3",
                  "product_id": "21932"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          },
          {
            "category": "product_name",
            "name": "azl4 kernel 0:6.18.50-1.4.azl4",
            "product": {
              "name": "azl4 kernel 0:6.18.50-1.4.azl4",
              "product_id": "1"
            }
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl4 kernel 0:6.18.50-1.4.azl4 as a component of Azure Linux 4.0",
          "product_id": "22078-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "22078"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "<azl3 kernel 0:6.6.157.1-1.azl3 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 0:6.6.157.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "21932-17084"
        },
        "product_reference": "21932",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-98881",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "21932-17084"
        ],
        "known_affected": [
          "17084-2"
        ],
        "under_investigation": [
          "22078-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-98881 net: bridge: remove stale rcu_barrier() in br_multicast_dev_del() - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98881.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-24T01:03:39.000Z",
          "details": "0:6.6.159.1-1.azl3:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-2"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "title": "net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()"
    }
  ]
}