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wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.273, 5.15.224, 6.1.191, 6.12.112, 6.18.54, 6.6.160, 7.2.8
CVEs
CVE-2026-98192
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 02:20 UTC · Revision 1

Source evidence

wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown

core-osv · Original source

Published 6 Oct 2026, 08:44 UTC

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.

osv:CVE-2026-98192

Kernel

Fixed versions: 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.112, 6.18.54, 7.2.8

Complete source record
{
  "id": "111d161bdf3ec8339b752746237c9f794187906d0dad14fc11d7b82d0766f457",
  "url": "https://osv.dev/vulnerability/CVE-2026-98192",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-98192",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.273",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.224",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98192",
      "aliases": [
        "CVE-2026-98192"
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                },
                {
                  "fixed": "e7f265d507ee55017b67ef4722df884468be1113"
                },
                {
                  "fixed": "7ce1e55a439968a298a63d3199cb1c2636429746"
                },
                {
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                {
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "5.10.0"
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                {
                  "fixed": "5.10.273"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.11.0"
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                {
                  "fixed": "5.15.224"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.191"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
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                  "fixed": "6.6.160"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.54"
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            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.19.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98192.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:49.519557442Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/15e59e377facc87ce82228279d88efaa89fdbca5",
        "https://git.kernel.org/stable/c/2bddc5d088cf430ecd913020472f1def32a36a3d",
        "https://git.kernel.org/stable/c/3edabc965bcce49cbb2ec1c2b91f8a555a8ec8bd",
        "https://git.kernel.org/stable/c/7ce1e55a439968a298a63d3199cb1c2636429746",
        "https://git.kernel.org/stable/c/915298dbb766d2311b0822ab6ef24780def0bd53",
        "https://git.kernel.org/stable/c/c0df0878e9110909cf0bec6080d72d36401a0c89",
        "https://git.kernel.org/stable/c/d9be5e75530772fc31637070d51e5717d6aeaa2a",
        "https://git.kernel.org/stable/c/e7f265d507ee55017b67ef4722df884468be1113",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98192.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98192",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98192.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98192",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499607,
  "published_at": "2026-10-06T08:44:32.912+00:00"
}