{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68393",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68393"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "Bluetooth: hci_sync: extend conn_hash lookup critical sections",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: extend conn_hash lookup critical sections\n\nUsing RCU-protected pointers outside the critical sections without\nrefcount is incorrect and may result to UAF.\n\nExtend critical section to cover both hci_conn_hash lookup and use of\nthe returned conn.\n\nAdd surrounding rcu_read_lock() also when return value is not used, in\npreparation for RCU lockdep requirement to hci_lookup_le_connect().\n\nThis avoids concurrent deletion of the conn before we are done\ndereferencing it.\n\nAlso, make sure to hold hdev->lock when accessing hdev->accept_list.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68393"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/83b7e67698d0b93f685875ce82c8d335436834f7"
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      "type": "FIX",
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      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The affected code is the Bluetooth HCI sync/scan management layer; both sides of the race are driven by LE radio events (connection complete, disconnect, periodic advertising sync creation/termination) from a device in radio range, requiring no local access.\nAC:L - A nearby attacker drives both sides of the race \u2014 repeated LE connect/disconnect and PA sync setup/teardown queue the hci_sync work while concurrently triggering hci_conn_del() on the event workqueue \u2014 so the window can be re-attempted arbitrarily until won.\nPR:N - The vulnerable hci_update_passive_scan_sync()/hci_update_accept_list_sync()/hci_le_set_ext_scan_param_sync() paths are invoked automatically by the kernel in response to incoming LE connection and periodic-advertising events; the remote attacker needs no credentials or pairing on the target.\nUI:N - No victim action is needed \u2014 background LE scanning and accept-list updates are performed autonomously by the host stack whenever connection state changes.\nS:U - The use-after-free occurs in kernel memory and its impact is confined to the kernel's own security authority, with no crossing into a separate authorization scope such as a hypervisor or IOMMU boundary.\nC:H - The freed hci_conn is read after release (conn->dst, conn->dst_type, PHY parameters), and a heap-groomed replacement object lets the attacker read attacker-chosen or sensitive kernel data, which can additionally be exfiltrated via the resulting accept-list/scan parameters.\nI:H - hci_conn is kfree()'d via bt_link_release() while still referenced, so reallocating the slab with a controlled object yields write/control-flow primitives typical of slab use-after-free, enabling kernel memory corruption and privilege escalation.\nA:H - Dereferencing the freed hci_conn readily causes slab corruption, KASAN splats, or an oops/panic in the Bluetooth workqueues, taking down the kernel."
    }
  }
}