{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68392",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68392"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix locking in unpair_device/disconnect_sync\n\nDereferencing RCU-protected pointers outside critical sections is\ninvalid and may lead to UAF.\n\nTake hdev->lock for hci_conn lookup and hci_abort_conn().  Don't use RCU\nto ensure the conn is fully initialized at this point.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/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-2026-68392"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/74f3e6e21ebc6c418d348f8ce68aef6fe6d82c82"
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      "url": "https://git.kernel.org/stable/c/8bc83f9ef6789571f399ff631a2a14a12b6d8585"
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    },
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    },
    {
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      "url": "https://git.kernel.org/stable/c/16cd66443957e4ad42155c6fec401012f600c6f8"
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    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is entered by a local process sending MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR_DEVICE on an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and the freeing side is drivable locally via /dev/vhci events or ioctl(HCIDEVDOWN)/hci_conn_hash_flush; no over-the-air access is required.\nAC:L - The attacker controls both sides of the race \u2014 repeatedly queuing the mgmt command while tearing the connection down (vhci-injected disconnect-complete, HCIDEVDOWN, or connection timeout) \u2014 and can retry indefinitely, so the window is reached reliably.\nPR:L - The mgmt command needs a trusted control socket, but that capability is routinely held by the Bluetooth daemon and exposed to unprivileged session users through BlueZ Disconnect/RemoveDevice D-Bus methods, so an ordinary local user can drive the path with attacker-chosen addresses.\nUI:N - Both the mgmt command and the concurrent connection teardown are initiated programmatically by the attacker; no victim action such as pairing confirmation or opening a file is needed.\nS:U - The corruption is confined to kernel heap objects managed by the Bluetooth subsystem within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - hci_abort_conn() dereferences the freed hci_conn (conn->hdev, conn->abort_reason, conn->handle) after it has been unlinked and released, so an attacker who reclaims the slab with controlled data obtains a read primitive over kernel memory and can leak pointers.\nI:H - The use-after-free is not read-only: hci_abort_conn() stores the attacker-reachable reason byte into conn->abort_reason and hci_conn_get() increments a refcount inside the freed object, giving a write primitive into reclaimed heap memory that is leverageable for control-flow hijack.\nA:H - Dereferencing a freed or partially initialized hci_conn and then queuing abort_conn_sync on it produces slab-use-after-free oopses, refcount underflow, and kernel panics, crashing the system."
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}