{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46056",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46056"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "Bluetooth: hci_event: fix potential UAF in SSP passkey handlers",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: fix potential UAF in SSP passkey handlers\n\nhci_conn lookup and field access must be covered by hdev lock in\nhci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise\nthe connection can be freed concurrently.\n\nExtend the hci_dev_lock critical section to cover all conn usage in both\nhandlers.\n\nKeep the existing keypress notification behavior unchanged by routing\nthe early exits through a common unlock path.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46056"
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      "scenario": "AV:A - The vulnerable handlers process HCI Secure Simple Pairing events (User Passkey Notify / Keypress Notify) driven by a remote Bluetooth peer during SSP pairing, so the attacker must be within Bluetooth radio range (adjacent), matching kernel guidance that Bluetooth = Adjacent.\nAC:L - This is a use-after-free where a remote peer drives the passkey/keypress events while connection teardown frees the conn from a concurrent context; the attacker influences both sides of the race and can retry, and UAF bugs are scored AC:L unless the race is uncontrollable.\nPR:N - The code path is reached by a remote Bluetooth device participating in the SSP pairing handshake, requiring no credentials or privileges on the target system.\nUI:N - The handlers execute automatically when the controller forwards the SSP passkey/keypress HCI events during the pairing protocol exchange; no local user action is required to reach the vulnerable code.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free reads fields (dst, type, dst_type, passkey) from a freed and potentially reallocated hci_conn object, which can disclose attacker-controlled or sensitive kernel heap contents.\nI:H - The handlers write to the freed object (passkey_notify and passkey_entered fields), giving a UAF write into reallocated heap memory that can be leveraged for heap grooming and control-flow corruption.\nA:H - A use-after-free on the hci_conn structure readily causes kernel oops/panic, yielding high availability impact."
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}