ghsa-m253-3j38-482h
Vulnerability from github
Published
2024-05-17 15:31
Modified
2024-06-27 15:30
Details

In the Linux kernel, the following vulnerability has been resolved:

wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach

This is the candidate patch of CVE-2023-47233 : https://nvd.nist.gov/vuln/detail/CVE-2023-47233

In brcm80211 driver,it starts with the following invoking chain to start init a timeout worker:

->brcmf_usb_probe ->brcmf_usb_probe_cb ->brcmf_attach ->brcmf_bus_started ->brcmf_cfg80211_attach ->wl_init_priv ->brcmf_init_escan ->INIT_WORK(&cfg->escan_timeout_work, brcmf_cfg80211_escan_timeout_worker);

If we disconnect the USB by hotplug, it will call brcmf_usb_disconnect to make cleanup. The invoking chain is :

brcmf_usb_disconnect ->brcmf_usb_disconnect_cb ->brcmf_detach ->brcmf_cfg80211_detach ->kfree(cfg);

While the timeout woker may still be running. This will cause a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker.

Fix it by deleting the timer and canceling the worker in brcmf_cfg80211_detach.

[arend.vanspriel@broadcom.com: keep timer delete as is and cancel work just before free]

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2024-35811"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-17T14:15:15Z",
    "severity": null
  },
  "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-\u003ebrcmf_usb_probe\n  -\u003ebrcmf_usb_probe_cb\n    -\u003ebrcmf_attach\n      -\u003ebrcmf_bus_started\n        -\u003ebrcmf_cfg80211_attach\n          -\u003ewl_init_priv\n            -\u003ebrcmf_init_escan\n              -\u003eINIT_WORK(\u0026cfg-\u003eescan_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  -\u003ebrcmf_usb_disconnect_cb\n    -\u003ebrcmf_detach\n      -\u003ebrcmf_cfg80211_detach\n        -\u003ekfree(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]",
  "id": "GHSA-m253-3j38-482h",
  "modified": "2024-06-27T15:30:39Z",
  "published": "2024-05-17T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35811"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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