wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure

{
  "id": "6ebeef5940f4d70f1cb0602d5571f11729f6fd74aeb824cc765ccee80d084cd7",
  "url": "https://osv.dev/vulnerability/CVE-2026-64568",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure ieee80211_set_unsol_bcast_probe_resp() calls kfree_rcu() on the old template before allocating the replacement. If the kzalloc() then fails, it returns -ENOMEM while link->u.ap.unsol_bcast_probe_resp still points at the object already queued for freeing. A later update or AP teardown re-queues that same rcu_head; the second free is caught by KASAN when the RCU sheaf is processed in softirq: BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850) Free of addr ffff88800d06f300 by task exploit/145 ... __rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940) rcu_free_sheaf (mm/slub.c:5850) rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869) handle_softirqs (kernel/softirq.c:622) The buggy address belongs to the cache kmalloc-128 of size 128 Queue the old object for kfree_rcu() only after the new one is published, matching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon().",
    "evidence": "osv:CVE-2026-64568",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.101",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64568",
      "aliases": [
        "CVE-2026-64568"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                {
                  "fixed": "0ace76e410d7f7d813b605825a3e593a79c3958f"
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                {
                  "fixed": "1d067abcd37062426c59ec73dbc4e87a63f33fea"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64568.json"
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.7.0"
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                  "fixed": "6.18.42"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.19.0"
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                  "fixed": "7.1.6"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64568.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.860353227Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0ace76e410d7f7d813b605825a3e593a79c3958f",
        "https://git.kernel.org/stable/c/1d067abcd37062426c59ec73dbc4e87a63f33fea",
        "https://git.kernel.org/stable/c/ca27a81cd77b698e5eb586a011bee6800c7ee4bd",
        "https://git.kernel.org/stable/c/d62b55b7c7dc62887d7fd5648fb38f0bfaef53ae",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64568.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64568",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64568.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64568",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510203,
  "published_at": "2026-08-05T08:08:06.625+00:00"
}