fkie_cve-2022-49942
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-06-18 13:46
Severity ?
Summary
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cdb9a8da9b84800eb15506cd9363cf0cf059e677
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: mac80211: No finalizar la CSA en modo IBSS si el estado es desconectado. Cuando no estamos conectados a un canal, enviar el anuncio de cambio de canal no tiene sentido. En ese caso, la lista BSS est\u00e1 vac\u00eda. Esto provoca que se omita el bucle for en cfg80211_get_bss(), por lo que la funci\u00f3n devuelve NULL (consulte la l\u00ednea 1424 de net/wireless/scan.c), lo que provoca la activaci\u00f3n de WARN_ON() en ieee80211_ibss_csa_beacon() (consulte la l\u00ednea 500 de net/mac80211/ibss.c), lo que se inform\u00f3 en el panel de control de syzkaller. Por lo tanto, se debe comprobar si existe una conexi\u00f3n antes de generar la baliza CSA en ieee80211_ibss_finish_csa()."
    }
  ],
  "id": "CVE-2022-49942",
  "lastModified": "2025-06-18T13:46:52.973",
  "metrics": {},
  "published": "2025-06-18T11:15:21.147",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cdb9a8da9b84800eb15506cd9363cf0cf059e677"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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