Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern()

{
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  "url": "https://osv.dev/vulnerability/CVE-2025-40294",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern() In the parse_adv_monitor_pattern() function, the value of the 'length' variable is currently limited to HCI_MAX_EXT_AD_LENGTH(251). The size of the 'value' array in the mgmt_adv_pattern structure is 31. If the value of 'pattern[i].length' is set in the user space and exceeds 31, the 'patterns[i].value' array can be accessed out of bound when copied. Increasing the size of the 'value' array in the 'mgmt_adv_pattern' structure will break the userspace. Considering this, and to avoid OOB access revert the limits for 'offset' and 'length' back to the value of HCI_MAX_AD_LENGTH. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.",
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      "modified": "2026-10-28T02:30:28.960822273Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3a50d59b3781bc3a4e96533612509546a4c309a7",
        "https://git.kernel.org/stable/c/4b7d4aa5399b5a64caee639275615c63c008540d",
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        "https://nvd.nist.gov/vuln/detail/CVE-2025-40294",
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  "source_id": "core-osv",
  "document_id": 495506,
  "published_at": "2025-12-08T00:46:17.899+00:00"
}