{
  "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-2026-98543 bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98543.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": "bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir",
    "tracking": {
      "current_release_date": "2026-11-12T17:50:24.000Z",
      "generator": {
        "date": "2026-11-13T08:02:35.885Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-98543",
      "initial_release_date": "2026-10-20T22:23:36.000Z",
      "revision_history": [
        {
          "date": "2026-10-20T22:23:36.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-10-21T18:39:17.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-11-12T17:50:24.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "4.0",
                "product": {
                  "name": "Azure Linux 4.0",
                  "product_id": "22078"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<azl4 kernel 0:6.18.50-1.5.azl4",
                "product": {
                  "name": "<azl4 kernel 0:6.18.50-1.5.azl4",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "azl4 kernel 0:6.18.50-1.5.azl4",
                "product": {
                  "name": "azl4 kernel 0:6.18.50-1.5.azl4",
                  "product_id": "22511"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          },
          {
            "category": "product_name",
            "name": "azl4 kernel 0:6.18.50-1.3.azl4",
            "product": {
              "name": "azl4 kernel 0:6.18.50-1.3.azl4",
              "product_id": "2"
            }
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl4 kernel 0:6.18.50-1.3.azl4 as a component of Azure Linux 4.0",
          "product_id": "22078-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "22078"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "<azl4 kernel 0:6.18.50-1.5.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": "azl4 kernel 0:6.18.50-1.5.azl4 as a component of Azure Linux 4.0",
          "product_id": "22511-22078"
        },
        "product_reference": "22511",
        "relates_to_product_reference": "22078"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-98543",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "22511-22078"
        ],
        "known_affected": [
          "22078-1"
        ],
        "under_investigation": [
          "22078-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-98543 bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98543.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-20T22:23:36.000Z",
          "details": "0:0:6.18.57-1.1.azl4.azl4:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "22078-1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "title": "bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir"
    }
  ]
}