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{
  "affected": [],
  "aliases": [
    "CVE-2026-64574"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T08:16:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: tear down new links on vif update error path\n\nWhen ieee80211_vif_update_links() adds new links it allocates a link\ncontainer for each and calls ieee80211_link_init() (which registers the\nper-link debugfs files with file-\u003eprivate_data pointing into the container)\nand ieee80211_link_setup(). If the subsequent drv_change_vif_links() fails,\nthe error path restores the old pointers and jumps to \u0027free\u0027, which frees\nthe new containers but never removes their debugfs entries or stops the\nlinks. The debugfs files survive with file-\u003eprivate_data dangling at the\nfreed container, so a later open()+read() (e.g. link-1/txpower)\ndereferences freed memory in ieee80211_if_read_link(), a use-after-free.\n\nThe removal path already dismantles links correctly via\nieee80211_tear_down_links(), which removes each link\u0027s keys and debugfs\nentries and calls ieee80211_link_stop(); the add path on the error branch\ndoes not. Commit be1ba9ed221f (\"wifi: mac80211: avoid weird state in error\npath\") hardened this same error path for the link-removal case\n(new_links == 0) but left the newly-added links\u0027 teardown unaddressed.\n\ndrv_change_vif_links() can fail at runtime on MLO drivers (internal\nallocation / queue / firmware command failures).\n\nRemove the new links\u0027 debugfs entries and stop them before freeing.\n\n  BUG: KASAN: slab-use-after-free in ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)\n  Read of size 8 at addr ffff888011290000 by task exploit/145\n  Call Trace:\n   ...\n   ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)\n   short_proxy_read (fs/debugfs/file.c:373)\n   vfs_read (fs/read_write.c:572)\n   ksys_read (fs/read_write.c:716)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  ...\n  Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a\n  RIP: 0010:ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)\n  Kernel panic - not syncing: Fatal exception",
  "id": "GHSA-5g36-vffc-3jvc",
  "modified": "2026-08-08T15:30:24Z",
  "published": "2026-08-05T09:31:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64574"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f7eaeb950adb77f71beb546e5ab30f90b41fe6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/329589417214d3b7221432e5b266ed2bba7ff674"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/901a73523e093beff123b54b1ceaf3113f18acc9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/952c02b33f56207a160421bcd61e7ac53c9c59ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c57d97f381306bbfba174e8f708419e007824e0c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

{
  "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-2026-64574 wifi: mac80211: tear down new links on vif update error path - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64574.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": "wifi: mac80211: tear down new links on vif update error path",
    "tracking": {
      "current_release_date": "2026-08-09T01:42:39.000Z",
      "generator": {
        "date": "2026-08-09T07:11:19.441Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-64574",
      "initial_release_date": "2026-08-09T01:42:39.000Z",
      "revision_history": [
        {
          "date": "2026-08-09T01:42:39.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "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": "\u003cazl3 kernel 0:6.6.145.2-1.azl3",
                "product": {
                  "name": "\u003cazl3 kernel 0:6.6.145.2-1.azl3",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 kernel 0:6.6.145.2-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.145.2-1.azl3",
                  "product_id": "21626"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "\u003cazl3 kernel 0:6.6.145.2-1.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": "azl3 kernel 0:6.6.145.2-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "21626-17084"
        },
        "product_reference": "21626",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-64574",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "21626-17084"
        ],
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-64574 wifi: mac80211: tear down new links on vif update error path - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64574.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-09T01:42:39.000Z",
          "details": "0:6.6.150.1-1.azl3:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "title": "wifi: mac80211: tear down new links on vif update error path"
    }
  ]
}