{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64126",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64126"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "Bluetooth: MGMT: validate Add Extended Advertising Data length",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate Add Extended Advertising Data length\n\nMGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command,\nwith MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size.  The handler\nthen uses cp->adv_data_len and cp->scan_rsp_len to validate and copy\ncp->data, but it never checks that those bytes are part of the mgmt\ncommand payload.\n\nA short command can therefore make add_ext_adv_data() pass an\nout-of-bounds pointer into tlv_data_is_valid().  If the bytes beyond\nthe command buffer are addressable, they can also be copied into the\nadvertising instance as scan response data, where the caller can read\nthem back via MGMT_OP_GET_ADV_INSTANCE.  The trigger requires\nCAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte\nslab-out-of-bounds read.\n\nReject commands whose length does not match the fixed header plus both\nadvertising data lengths before parsing cp->data.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64126"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d"
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  "database_specific": {
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through a local Bluetooth MGMT socket (AF_BLUETOOTH, HCI_CHANNEL_CONTROL) via sendmsg(), not from remote Bluetooth air traffic or network protocols.\nAC:L - An attacker fully controls the malformed MGMT command and length fields and can retry reliably; no race or victim-dependent timing is required to trigger the out-of-bounds read and copy.\nPR:L - Exploitation requires CAP_NET_ADMIN to obtain an HCI_SOCK_TRUSTED MGMT socket, which is reachable by an unprivileged user via user namespaces (e.g. unshare with CAP_NET_ADMIN) on the CONTROL-channel bind path.\nUI:N - No victim interaction is required; the attacker triggers the flaw directly by sending a crafted MGMT_OP_ADD_EXT_ADV_DATA command.\nS:U - Impact is confined to kernel memory disclosure and modification of Bluetooth advertising state within the same kernel security boundary, with no VM escape or cross-authority boundary crossing.\nC:H - A short command causes slab out-of-bounds reads (KASAN-reported) via tlv_data_is_valid(), and addressable bytes beyond the command buffer can be copied into scan response data and potentially exfiltrated over BLE advertising.\nI:H - The out-of-bounds pointer is used in memcpy() into kernel advertising structures, constituting kernel memory corruption with attacker-influenced content that can alter system-controlled Bluetooth data.\nA:L - While the primary impact is information disclosure, out-of-bounds kernel memory access can cause oopses or instability on some layouts; when uncertain, availability impact is rated above none."
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}