GHSA-HRQP-97P2-7MMR
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In the Linux kernel, the following vulnerability has been resolved:
wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown
wcn36xx_dxe_deinit() tears down the TX ack timer with timer_delete(), which only dequeues the timer and does not wait for a callback that is already executing; the preceding free_irq() calls synchronize the interrupt handlers only. The callback, wcn36xx_dxe_tx_timer(), can therefore be running past the teardown and use the wcn freed along with the ieee80211_hw in wcn36xx_remove(): it takes wcn->dxe_lock, reads wcn->tx_ack_skb and passes wcn->hw to ieee80211_tx_status_irqsafe().
Fix this by using timer_shutdown_sync(), which waits for a running callback and also prevents the timer from being rearmed again. The timer is set up again by wcn36xx_dxe_init() on the next start, so the start/stop cycle is unaffected.
This issue was found by an in-house static analysis tool.
{
"affected": [],
"aliases": [
"CVE-2026-98192"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:04Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown\n\nwcn36xx_dxe_deinit() tears down the TX ack timer with timer_delete(),\nwhich only dequeues the timer and does not wait for a callback that is\nalready executing; the preceding free_irq() calls synchronize the\ninterrupt handlers only. The callback, wcn36xx_dxe_tx_timer(), can\ntherefore be running past the teardown and use the wcn freed along\nwith the ieee80211_hw in wcn36xx_remove(): it takes wcn-\u003edxe_lock,\nreads wcn-\u003etx_ack_skb and passes wcn-\u003ehw to\nieee80211_tx_status_irqsafe().\n\nFix this by using timer_shutdown_sync(), which waits for a running\ncallback and also prevents the timer from being rearmed again. The\ntimer is set up again by wcn36xx_dxe_init() on the next start, so the\nstart/stop cycle is unaffected.\n\nThis issue was found by an in-house static analysis tool.",
"id": "GHSA-hrqp-97p2-7mmr",
"modified": "2026-10-06T09:31:29Z",
"published": "2026-10-06T09:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98192"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2bddc5d088cf430ecd913020472f1def32a36a3d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3edabc965bcce49cbb2ec1c2b91f8a555a8ec8bd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c0df0878e9110909cf0bec6080d72d36401a0c89"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d9be5e75530772fc31637070d51e5717d6aeaa2a"
}
],
"schema_version": "1.4.0",
"severity": []
}
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