{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63947",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63947"
  ],
  "published": "2026-07-19T14:56:29Z",
  "summary": "Bluetooth: HIDP: fix missing length checks in hidp_input_report()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: fix missing length checks in hidp_input_report()\n\nhidp_input_report() reads keyboard and mouse payload data from an skb\nwithout first verifying that skb->len contains enough data.\n\nhidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching\nto hidp_input_report(). If a paired device sends a truncated packet,\nthe handler reads beyond the valid skb data, resulting in an\nout-of-bounds read of skb data. The OOB bytes may be interpreted as\nphantom key presses or spurious mouse movement.\n\nReplace the open-coded length tracking and pointer arithmetic with\nskb_pull_data() calls. skb_pull_data() returns NULL if the requested\nbytes are not present, eliminating the need for a manual size variable\nand the separate skb->len guard.",
  "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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      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The bug is reached when a connected Bluetooth HID peer sends malformed HIDP interrupt (or control DATA) frames over L2CAP ACL; packets traverse HCI \u2192 l2cap_recv_acldata() \u2192 l2cap_data_channel() \u2192 l2cap_sock_recv_cb() \u2192 HIDP session thread \u2192 hidp_recv_intr_frame()/hidp_process_data() \u2192 hidp_input_report(), which is an adjacent Bluetooth attack surface.\nAC:L - Exploitation only requires sending deliberately truncated HIDP input reports on an already-established HIDP/L2CAP session; the attacker fully controls packet length and can trigger the out-of-bounds read reliably on every malformed frame with no race or special memory layout.\nPR:N - The attacker is an external Bluetooth HID device sending L2CAP payloads and needs no Linux account, capability, or namespace privilege; CAP_NET_ADMIN is only required for bluetoothd to register the session, not for the malicious peer to deliver the crafted packets.\nUI:N - Once a HIDP session is active, exploitation is automatic from crafted Bluetooth traffic and requires no further victim action; pairing/connection is an attacker prerequisite, not user interaction at exploit time (consistent with prior Bluetooth HIDP CNA scoring such as CVE-2026-23462).\nS:U - Impact is confined to kernel HIDP/input handling and forged input events delivered within the same kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The vulnerable code performs out-of-bounds reads of up to eight keyboard or four mouse payload bytes beyond skb->len, and per CVSS kernel guidance any out-of-bounds read is rated High because adjacent skb tailroom may contain stale packet or kernel heap data observable through phantom key/mouse event side channels.\nI:H - Out-of-bounds bytes are interpreted as boot-protocol keyboard scancodes and mouse button/movement events, enabling phantom key presses and pointer injection into the system input layer; on laptops, kiosks, automotive consoles, and Android handsets this can forge arbitrary keystrokes/clicks against the active user session.\nA:H - Reading keyboard/mouse payload bytes past valid skb->len is undefined behavior on tightly allocated skbs with no tailroom and can fault the kernel; even when reads stay within tailroom, forged input can repeatedly disrupt session availability on shared/public Bluetooth keyboard deployments, and under the conservative scoring rule this is rated High when crash potential cannot be excluded."
    }
  }
}