ghsa-8775-7cpf-rm3f
Vulnerability from github
Published
2025-06-18 12:30
Modified
2025-06-18 12:30
Details

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

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

When we are not connected to a channel, sending channel "switch" announcement doesn't make any sense.

The BSS list is empty in that case. This causes the for loop in cfg80211_get_bss() to be bypassed, so the function returns NULL (check line 1424 of net/wireless/scan.c), causing the WARN_ON() in ieee80211_ibss_csa_beacon() to get triggered (check line 500 of net/mac80211/ibss.c), which was consequently reported on the syzkaller dashboard.

Thus, check if we have an existing connection before generating the CSA beacon in ieee80211_ibss_finish_csa().

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49942"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:21Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: Don\u0027t finalize CSA in IBSS mode if state is disconnected\n\nWhen we are not connected to a channel, sending channel \"switch\"\nannouncement doesn\u0027t make any sense.\n\nThe BSS list is empty in that case. This causes the for loop in\ncfg80211_get_bss() to be bypassed, so the function returns NULL\n(check line 1424 of net/wireless/scan.c), causing the WARN_ON()\nin ieee80211_ibss_csa_beacon() to get triggered (check line 500\nof net/mac80211/ibss.c), which was consequently reported on the\nsyzkaller dashboard.\n\nThus, check if we have an existing connection before generating\nthe CSA beacon in ieee80211_ibss_finish_csa().",
  "id": "GHSA-8775-7cpf-rm3f",
  "modified": "2025-06-18T12:30:36Z",
  "published": "2025-06-18T12:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49942"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cdb9a8da9b84800eb15506cd9363cf0cf059e677"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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