CVE-2026-80762 (GCVE-0-2026-80762)
Vulnerability from cvelistv5
Published
2026-09-04 15:12
Modified
2026-09-04 15:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix accept list UAF during suspend hci_update_event_filter_sync() walks hdev->accept_list while sending a synchronous HCI command for each remote-wakeup device. The suspend path holds hdev->req_lock, but accept-list updates are serialized by hdev->lock. Consequently, remove_device() can free the current list entry during the controller wait. The following interleaving causes the use-after-free: hci_update_event_filter_sync() remove_device() fetch accept-list entry hci_set_event_filter_sync() wait for controller response hci_dev_lock() list_del() kfree() hci_dev_unlock() read the freed list.next KASAN reported: BUG: KASAN: slab-use-after-free in hci_suspend_sync+0x835/0x910 Read of size 8 at addr ffff88810bec8440 by task kworker/0:1/10 Workqueue: events vhci_suspend_work Call Trace: hci_suspend_sync+0x835/0x910 hci_suspend_dev+0x182/0x450 process_one_work+0x661/0x1090 worker_thread+0x45b/0xd10 Allocated by task 86: hci_bdaddr_list_add_with_flags+0x1a8/0x400 add_device+0x381/0x820 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 91: kfree+0x131/0x3c0 remove_device+0x429/0xb70 hci_sock_sendmsg+0x1033/0x1ea0 Snapshot the remote-wakeup addresses under hdev->lock. Release the lock before sending HCI commands. Clear the controller event filter before building the snapshot, and skip allocation and the second list traversal when there are no matching entries. This preserves the original filter and scan-state updates without retaining an accept-list node across a controller wait.
References
Impacted products
Vendor Product Version
Linux Linux Version: 182ee45da083db4e3e621541ccf255bfa9652214
Version: 182ee45da083db4e3e621541ccf255bfa9652214
Version: 182ee45da083db4e3e621541ccf255bfa9652214
Version: 182ee45da083db4e3e621541ccf255bfa9652214
Version: 182ee45da083db4e3e621541ccf255bfa9652214
Version: 182ee45da083db4e3e621541ccf255bfa9652214
Version: 182ee45da083db4e3e621541ccf255bfa9652214
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{
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          "programFiles": [
            "net/bluetooth/hci_sync.c"
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      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix accept list UAF during suspend\n\nhci_update_event_filter_sync() walks hdev-\u003eaccept_list while sending a\nsynchronous HCI command for each remote-wakeup device.  The suspend path\nholds hdev-\u003ereq_lock, but accept-list updates are serialized by hdev-\u003elock.\nConsequently, remove_device() can free the current list entry during the\ncontroller wait.\n\nThe following interleaving causes the use-after-free:\n\n  hci_update_event_filter_sync()    remove_device()\n  fetch accept-list entry\n  hci_set_event_filter_sync()\n    wait for controller response    hci_dev_lock()\n                                    list_del()\n                                    kfree()\n                                    hci_dev_unlock()\n  read the freed list.next\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in hci_suspend_sync+0x835/0x910\n  Read of size 8 at addr ffff88810bec8440 by task kworker/0:1/10\n  Workqueue: events vhci_suspend_work\n  Call Trace:\n   hci_suspend_sync+0x835/0x910\n   hci_suspend_dev+0x182/0x450\n   process_one_work+0x661/0x1090\n   worker_thread+0x45b/0xd10\n\n  Allocated by task 86:\n   hci_bdaddr_list_add_with_flags+0x1a8/0x400\n   add_device+0x381/0x820\n   hci_sock_sendmsg+0x1033/0x1ea0\n\n  Freed by task 91:\n   kfree+0x131/0x3c0\n   remove_device+0x429/0xb70\n   hci_sock_sendmsg+0x1033/0x1ea0\n\nSnapshot the remote-wakeup addresses under hdev-\u003elock.  Release the lock\nbefore sending HCI commands.  Clear the controller event filter before\nbuilding the snapshot, and skip allocation and the second list traversal\nwhen there are no matching entries.  This preserves the original filter\nand scan-state updates without retaining an accept-list node across a\ncontroller wait."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:34.354Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bb5f5414d1a6272a16f68684e998f4063dd19f57"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5181516a9f5c2fdb3271cdad72a5b16c6963a44"
        },
        {
          "url": "https://git.kernel.org/stable/c/87ad116ac3abc6f2ce2b5b6c488f633003581eee"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe93a697a7a92fa9adf78c9ff67a10db3193290c"
        },
        {
          "url": "https://git.kernel.org/stable/c/95bb57bc11a91caf042ad00fca85e480d3fda37f"
        },
        {
          "url": "https://git.kernel.org/stable/c/29c59212a507804d7616b8abf491d30b4ab8e75f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f57b399c4fa1501b2d5451f52d861ece86bcf3db"
        }
      ],
      "title": "Bluetooth: hci_sync: Fix accept list UAF during suspend",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80762",
    "datePublished": "2026-09-04T15:12:34.354Z",
    "dateReserved": "2026-08-26T14:34:25.791Z",
    "dateUpdated": "2026-09-04T15:12:34.354Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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