{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-35811",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-35811"
  ],
  "published": "2024-05-17T13:23:58Z",
  "summary": "wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach\n\nThis is the candidate patch of CVE-2023-47233 :\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-47233\n\nIn brcm80211 driver,it starts with the following invoking chain\nto start init a timeout worker:\n\n->brcmf_usb_probe\n  ->brcmf_usb_probe_cb\n    ->brcmf_attach\n      ->brcmf_bus_started\n        ->brcmf_cfg80211_attach\n          ->wl_init_priv\n            ->brcmf_init_escan\n              ->INIT_WORK(&cfg->escan_timeout_work,\n\t\t  brcmf_cfg80211_escan_timeout_worker);\n\nIf we disconnect the USB by hotplug, it will call\nbrcmf_usb_disconnect to make cleanup. The invoking chain is :\n\nbrcmf_usb_disconnect\n  ->brcmf_usb_disconnect_cb\n    ->brcmf_detach\n      ->brcmf_cfg80211_detach\n        ->kfree(cfg);\n\nWhile the timeout woker may still be running. This will cause\na use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker.\n\nFix it by deleting the timer and canceling the worker in\nbrcmf_cfg80211_detach.\n\n[arend.vanspriel@broadcom.com: keep timer delete as is and cancel work just before free]",
  "affected": [
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        "name": "linux"
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-35811"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z"
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}