CVE-2022-49942 (GCVE-0-2022-49942)
Vulnerability from cvelistv5
Published
2025-06-18 10:59
Modified
2025-06-18 10:59
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
Impacted products
Vendor Product Version
Linux Linux Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
Version: cd7760e62c2ac8581f050b2d36501d1a60beaf83
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/ibss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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            }
          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "4.9.328",
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            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.293",
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            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.213",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.66",
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            },
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              "version": "5.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.328",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
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                  "versionEndExcluding": "4.14.293",
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                },
                {
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                  "versionEndExcluding": "6.0",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T10:59:57.610Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cdb9a8da9b84800eb15506cd9363cf0cf059e677"
        },
        {
          "url": "https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b"
        },
        {
          "url": "https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780"
        },
        {
          "url": "https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508"
        },
        {
          "url": "https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d"
        },
        {
          "url": "https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0"
        }
      ],
      "title": "wifi: mac80211: Don\u0027t finalize CSA in IBSS mode if state is disconnected",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49942",
    "datePublished": "2025-06-18T10:59:57.610Z",
    "dateReserved": "2025-06-18T10:57:27.381Z",
    "dateUpdated": "2025-06-18T10:59:57.610Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49942\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:21.147\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"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().\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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