CVE-2022-49942 (GCVE-0-2022-49942)

Vulnerability from cvelistv5 – Published: 2025-06-18 10:59 – Updated: 2025-06-18 10:59
VLAI?
Title
wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected
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().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < cdb9a8da9b84800eb15506cd9363cf0cf059e677 (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < 1691a48aef0a82d1754b9853dae7e3f5cacdf70b (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < d9eb37db6a28b59a95a3461450ee209654c5f95b (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < 66689c5c02acd4d76c28498fe220998610aec61e (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < dd649b49219a0388cc10fc40e4c2ea681566a780 (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < 552ba102a6898630a7d16887f29e606d6fabe508 (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < 864e280cb3a9a0f5212b16ef5057c4e692f7039d (git)
Affected: cd7760e62c2ac8581f050b2d36501d1a60beaf83 , < 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0 (git)
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    Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 4.9.328 , ≤ 4.9.* (semver)
Unaffected: 4.14.293 , ≤ 4.14.* (semver)
Unaffected: 4.19.258 , ≤ 4.19.* (semver)
Unaffected: 5.4.213 , ≤ 5.4.* (semver)
Unaffected: 5.10.142 , ≤ 5.10.* (semver)
Unaffected: 5.15.66 , ≤ 5.15.* (semver)
Unaffected: 5.19.8 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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{
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      "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"
      },
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          "url": "https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0"
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      ],
      "title": "wifi: mac80211: Don\u0027t finalize CSA in IBSS mode if state is disconnected",
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    "datePublished": "2025-06-18T10:59:57.610Z",
    "dateReserved": "2025-06-18T10:57:27.381Z",
    "dateUpdated": "2025-06-18T10:59:57.610Z",
    "state": "PUBLISHED"
  },
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}


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