CVE-2026-98632 (GCVE-0-2026-98632)
Vulnerability from cvelistv5
Published
2026-10-18 15:19
Modified
2026-10-19 09:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: Dequeue pending mesh_send_sync entries on cancel In send_cancel(), pending mesh_tx objects are removed from the hdev->mesh_pending list and freed via mesh_send_complete(). However, if a mesh transmission was already queued onto hdev->cmd_sync_work_list via mesh_next(), the queued entry retains a raw pointer to mesh_tx. When hci_cmd_sync_work later processes the entry, it attempts to execute mesh_send_sync and its destroy callback mesh_send_start_complete using the already freed mesh_tx pointer, leading to a use-after-free. Fix this by invoking hci_cmd_sync_dequeue() for mesh_send_sync on the target mesh_tx before completing it. If the entry is found and dequeued, its destroy callback will complete and free the object; otherwise, mesh_send_complete() is called directly. Additionally, ensure the transmission queue advances after cancellation or errors. In mesh_send_start_complete(), call mesh_next() on error unless err is -ECANCELED, because hci_cmd_sync_dequeue() holds hdev->cmd_sync_work_lock and calling mesh_next() synchronously would deadlock. Instead, advance the queue in send_cancel() once the lock is released and if no transmission is in progress.
References
Impacted products
Vendor Product Version
Linux Linux Version: b338d91703fae6f6afd67f3f75caa3b8f36ddef3
Version: b338d91703fae6f6afd67f3f75caa3b8f36ddef3
Version: b338d91703fae6f6afd67f3f75caa3b8f36ddef3
Version: b338d91703fae6f6afd67f3f75caa3b8f36ddef3
Version: b338d91703fae6f6afd67f3f75caa3b8f36ddef3
Version: b338d91703fae6f6afd67f3f75caa3b8f36ddef3
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{
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            "net/bluetooth/mgmt.c"
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: Dequeue pending mesh_send_sync entries on cancel\n\nIn send_cancel(), pending mesh_tx objects are removed from the\nhdev-\u003emesh_pending list and freed via mesh_send_complete().  However, if\na mesh transmission was already queued onto hdev-\u003ecmd_sync_work_list via\nmesh_next(), the queued entry retains a raw pointer to mesh_tx.\n\nWhen hci_cmd_sync_work later processes the entry, it attempts to execute\nmesh_send_sync and its destroy callback mesh_send_start_complete using\nthe already freed mesh_tx pointer, leading to a use-after-free.\n\nFix this by invoking hci_cmd_sync_dequeue() for mesh_send_sync on the\ntarget mesh_tx before completing it.  If the entry is found and dequeued,\nits destroy callback will complete and free the object; otherwise,\nmesh_send_complete() is called directly.\n\nAdditionally, ensure the transmission queue advances after cancellation\nor errors.  In mesh_send_start_complete(), call mesh_next() on error\nunless err is -ECANCELED, because hci_cmd_sync_dequeue() holds\nhdev-\u003ecmd_sync_work_lock and calling mesh_next() synchronously would\ndeadlock.  Instead, advance the queue in send_cancel() once the lock is\nreleased and if no transmission is in progress."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:00.460Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f84e52829021d00bca8e067302f597c71af1f71a"
        },
        {
          "url": "https://git.kernel.org/stable/c/718a8ffa180d469f99ad4f746f00cafd39456415"
        },
        {
          "url": "https://git.kernel.org/stable/c/084be90948632a5a358821e687b11a14445aae76"
        },
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          "url": "https://git.kernel.org/stable/c/2189a219397d8e73808a67c4aade837b635705da"
        },
        {
          "url": "https://git.kernel.org/stable/c/03ced4687fb79286be7fdee0fc58d2c74de3e7bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/71af682ba4692c2ed9ace4c3d4ca462ae368c029"
        }
      ],
      "title": "Bluetooth: mgmt: Dequeue pending mesh_send_sync entries on cancel",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98632",
    "datePublished": "2026-10-18T15:19:56.287Z",
    "dateReserved": "2026-09-25T10:25:14.361Z",
    "dateUpdated": "2026-10-19T09:23:00.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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