CVE-2026-93804 (GCVE-0-2026-93804)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:02 – Updated: 2026-09-25 12:43
VLAI
Title
wifi: mac80211: ibss: wait for in-flight TX on disconnect
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: ibss: wait for in-flight TX on disconnect While leaving an IBSS in ieee80211_ibss_disconnect() mac80211 flushes stations, turns the carrier off and immediately tells the driver to leave as well. While there may be synchronize_net() in station flush and in this code later, packets can still be transmitted due to cross-CPU race conditions after carrier off is set. Therefore, it's possible for a race to happen where a TX to the driver occurs while or after telling it to leave the IBSS. This can be confusing to drivers, and in the case of iwlwifi leads to an attempt to use invalid queues. Move netif_carrier_off() to occur before sta_info_flush() during IBSS disconnect, and add synchronize_net() if flushing didn't, so that the synchronize_net() always happens between turning the carrier off and telling the driver, avoiding this race.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 86a2ea4134b48f6371103cfceb521bf2d2bf76cd , < 20a3fb5e1a95caa34896853ca17a50d21c754969 (git)
Affected: 86a2ea4134b48f6371103cfceb521bf2d2bf76cd , < b3451e6971248250312ad32dd7f63cc9f0a925f5 (git)
Affected: 86a2ea4134b48f6371103cfceb521bf2d2bf76cd , < d0e69d9afa59b93c30294eba89b1f15f69e91105 (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/mac80211/ibss.c"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: ibss: wait for in-flight TX on disconnect\n\nWhile leaving an IBSS in ieee80211_ibss_disconnect() mac80211 flushes\nstations, turns the carrier off and immediately tells the driver to\nleave as well. While there may be synchronize_net() in station flush\nand in this code later, packets can still be transmitted due to\ncross-CPU race conditions after carrier off is set.\nTherefore, it\u0027s possible for a race to happen where a TX to the\ndriver occurs while or after telling it to leave the IBSS. This can\nbe confusing to drivers, and in the case of iwlwifi leads to an\nattempt to use invalid queues.\n\nMove netif_carrier_off() to occur before sta_info_flush() during\nIBSS disconnect, and add synchronize_net() if flushing didn\u0027t,\nso that the synchronize_net() always happens between turning the\ncarrier off and telling the driver, avoiding this race."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T12:43:11.708Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d0e69d9afa59b93c30294eba89b1f15f69e91105"
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    "datePublished": "2026-09-24T16:02:38.223Z",
    "dateReserved": "2026-09-18T17:59:28.790Z",
    "dateUpdated": "2026-09-25T12:43:11.708Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: ibss: wait for in-flight TX on disconnect\n\nWhile leaving an IBSS in ieee80211_ibss_disconnect() mac80211 flushes\nstations, turns the carrier off and immediately tells the driver to\nleave as well. While there may be synchronize_net() in station flush\nand in this code later, packets can still be transmitted due to\ncross-CPU race conditions after carrier off is set.\nTherefore, it\u0027s possible for a race to happen where a TX to the\ndriver occurs while or after telling it to leave the IBSS. This can\nbe confusing to drivers, and in the case of iwlwifi leads to an\nattempt to use invalid queues.\n\nMove netif_carrier_off() to occur before sta_info_flush() during\nIBSS disconnect, and add synchronize_net() if flushing didn\u0027t,\nso that the synchronize_net() always happens between turning the\ncarrier off and telling the driver, avoiding this race."
          }
        ],
        "id": "CVE-2026-93804",
        "lastModified": "2026-09-25T13:17:21.260",
        "metrics": {},
        "published": "2026-09-24T17:17:13.350",
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-24T23:47:29Z",
      "cve": "CVE-2026-93804",
      "id": "CVE-2026-93804",
      "initial_release_date": "2026-09-24T23:47:29Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93804",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93804.json",
      "version": "2"
    }
  }
}



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