CVE-2026-98707 (GCVE-0-2026-98707)
Vulnerability from cvelistv5
Published
2026-10-18 15:46
Modified
2026-10-30 12:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: a87f736d942c86255e3088c606f0e3eab6bbf784
Version: a87f736d942c86255e3088c606f0e3eab6bbf784
Version: a87f736d942c86255e3088c606f0e3eab6bbf784
Version: a87f736d942c86255e3088c606f0e3eab6bbf784
Version: a87f736d942c86255e3088c606f0e3eab6bbf784
Version: a87f736d942c86255e3088c606f0e3eab6bbf784
Version: a87f736d942c86255e3088c606f0e3eab6bbf784
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: shut down RX BA session timer on teardown\n\nTearing down an RX BA session can leave the session timer queued on a\nfreed tid_rx. Later timer-wheel processing and the timer callback itself\nthen run against freed memory.\n\nAn RX BAR handler can dereference tid_rx under RCU before teardown\nunpublishes it and stay in its read-side critical section while teardown\ndeletes the session timer. The stale handler can then rearm the timer\nafter timer_delete_sync() returns and before the RCU callback frees\ntid_rx.\n\nUse timer_shutdown_sync() so rearm attempts become ineffective once\nteardown starts. Keep reorder_timer unchanged: teardown marks the session\nremoved under reorder_lock and its release path checks that state before\nrearming. session_timer has no equivalent guard because\nieee80211_rx_h_ctrl() rearms it before taking reorder_lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:58.097Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/225c67a0bea0bd42f568f4842e747bb7f4bafebb"
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        {
          "url": "https://git.kernel.org/stable/c/18cf74311f3f0bc77384549d270c489f64c6510a"
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        {
          "url": "https://git.kernel.org/stable/c/d0da6ab1fc53a68025929baf0947519c6c1684dc"
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          "url": "https://git.kernel.org/stable/c/7bb2a5bd4f07192fca35644fab7d49a17bfbc861"
        },
        {
          "url": "https://git.kernel.org/stable/c/481f9230284c27052b59c587069f232c5d84779e"
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          "url": "https://git.kernel.org/stable/c/09b7d5e4f88504e62ddf4ff31ebeebb3b87578ba"
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        {
          "url": "https://git.kernel.org/stable/c/e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e"
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      "title": "wifi: mac80211: shut down RX BA session timer on teardown",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98707",
    "datePublished": "2026-10-18T15:46:37.587Z",
    "dateReserved": "2026-09-25T10:25:14.365Z",
    "dateUpdated": "2026-10-30T12:38:58.097Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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