GHSA-8MVQ-3RMC-C8VM
Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:33In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98707"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-18T16:17:24Z",
"severity": null
},
"details": "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.",
"id": "GHSA-8mvq-3rmc-c8vm",
"modified": "2026-10-30T15:33:57Z",
"published": "2026-10-18T18:32:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98707"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/09b7d5e4f88504e62ddf4ff31ebeebb3b87578ba"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/18cf74311f3f0bc77384549d270c489f64c6510a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/225c67a0bea0bd42f568f4842e747bb7f4bafebb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/481f9230284c27052b59c587069f232c5d84779e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7bb2a5bd4f07192fca35644fab7d49a17bfbc861"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d0da6ab1fc53a68025929baf0947519c6c1684dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e"
}
],
"schema_version": "1.4.0",
"severity": []
}
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