CVE-2026-98192 (GCVE-0-2026-98192)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-06 08:44
VLAI
Title
wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown
Summary
In 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fdf21cc3714939dd4327f3d664fe5863d15ccb31 , < 3edabc965bcce49cbb2ec1c2b91f8a555a8ec8bd (git)
Affected: fdf21cc3714939dd4327f3d664fe5863d15ccb31 , < 2bddc5d088cf430ecd913020472f1def32a36a3d (git)
Affected: fdf21cc3714939dd4327f3d664fe5863d15ccb31 , < c0df0878e9110909cf0bec6080d72d36401a0c89 (git)
Affected: fdf21cc3714939dd4327f3d664fe5863d15ccb31 , < d9be5e75530772fc31637070d51e5717d6aeaa2a (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/wcn36xx/dxe.c"
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          "value": "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."
        }
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        "dateUpdated": "2026-10-06T08:44:32.912Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-09-25T10:25:14.323Z",
    "dateUpdated": "2026-10-06T08:44:32.912Z",
    "state": "PUBLISHED"
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            "value": "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."
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      "cve": "CVE-2026-98192",
      "id": "CVE-2026-98192",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-98192",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98192.json",
      "version": "2"
    }
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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