{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68404",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68404"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "wifi: cfg80211: use wiphy work for socket owner autodisconnect",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: use wiphy work for socket owner autodisconnect\n\nnl80211_netlink_notify() walks the cfg80211 wireless device list when a\nNETLINK_GENERIC socket is released. If the socket owns a connection, the\nnotifier queues the embedded wdev->disconnect_wk work item.\n\nThat work is a plain work_struct today. NETDEV_GOING_DOWN cancels it, but a\nNETLINK_URELEASE notifier that already observed conn_owner_nlportid can\nqueue it after that cancel returns. _cfg80211_unregister_wdev() then\nremoves the wdev from the list and waits for RCU readers, but\nsynchronize_net() does not drain work queued by such a reader.\n\nMake the autodisconnect work a wiphy_work instead. The callback already\nneeds the wiphy mutex, and wiphy_work runs under that mutex. This lets\nteardown cancel pending autodisconnect work while holding the mutex,\nwithout a cancel_work_sync() vs. worker locking concern.\n\nAlso cancel the wiphy work after list_del_rcu() and synchronize_net(). Any\nNETLINK_URELEASE notifier that had already reached the wdev list has then\neither queued the work and it is removed, or can no longer find the wdev.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68404"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6d6123fef5a4af175cc6b6b12a03dd0f3c240b79"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0c2ed186bbe14304415476d6707b747dddcd8583"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached through local nl80211/generic-netlink operations: setting NL80211_ATTR_SOCKET_OWNER on a connect/join command, closing the owning netlink socket, and tearing down the wireless interface. No network or radio traffic is required, so the attack vector is Local.\nAC:L - The attacker controls both sides of the race \u2014 the NETLINK_URELEASE notification (by closing its own socket) and the wdev teardown (by downing/deleting the interface) \u2014 and can repeat the sequence in a tight loop until the work is queued after the cancel window.\nPR:L - The relevant nl80211 commands use GENL_UNS_ADMIN_PERM and the family is netnsok, and mac80211_hwsim's HWSIM_CMD_NEW_RADIO likewise creates a wiphy in the caller's netns (wiphy_net_set(genl_info_net(info))), so an unprivileged user in a user+net namespace (unshare -Urn) obtains the required CAP_NET_ADMIN.\nUI:N - The entire sequence \u2014 creating/owning the connection, closing the socket, and removing the interface \u2014 is performed by the attacker's own process with no victim action required.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed wireless_dev lives in the net_device private allocation; a use-after-free on that slab lets an attacker reclaim and inspect kernel heap contents, and cfg80211_autodisconnect_wk dereferences the stale object, enabling disclosure of arbitrary kernel memory.\nI:H - Queueing writes work list pointers into freed memory, and process_one_work() later loads work->func from the reclaimed allocation, giving an attacker who sprays the slab a controlled kernel function pointer call and thus arbitrary write/code execution.\nA:H - Running cfg80211_autodisconnect_wk against a freed wireless_dev dereferences stale pointers and drives disconnect paths on destroyed state, reliably producing an oops or panic even without successful exploitation."
    }
  }
}