Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt_CVE-2026-46138

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt\n\nhci_le_create_big_complete_evt() iterates over BT_BOUND connections for\na BIG handle using a while loop, accessing ev->bis_handle[i++] on each\niteration.  However, there is no check that i stays within ev->num_bis\nbefore the array access.\n\nWhen a controller sends a LE_Create_BIG_Complete event with fewer\nbis_handle entries than there are BT_BOUND connections for that BIG,\nor with num_bis=0, the loop reads beyond the valid bis_handle[] flex\narray into adjacent heap memory.  Since the out-of-bounds values\ntypically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle()\nrejects them and the connection remains in BT_BOUND state.  The same\nconnection is then found again by hci_conn_hash_lookup_big_state(),\ncreating an infinite loop with hci_dev_lock held.\n\nFix this by terminating the BIG if in case not all BIS could be setup\nproperly.",
    "published": "2026-05-28T09:35:54.467Z",
    "modified": "2026-05-30T10:48:16.091Z",
    "type": "cve",
    "title": "Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd\nhttps://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17\nhttps://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17\nhttps://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774\nhttps://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586",
    "id": "CVE-2026-46138",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a0bfde167b506423111ddb8cd71930497a40fc54\nLinux Linux a0bfde167b506423111ddb8cd71930497a40fc54\nLinux Linux a0bfde167b506423111ddb8cd71930497a40fc54\nLinux Linux a0bfde167b506423111ddb8cd71930497a40fc54\nLinux Linux a0bfde167b506423111ddb8cd71930497a40fc54\nLinux Linux b475c1109251e30ec21fb574d72a1c71a4ab0039\nLinux Linux 2ccde10127447c1a5caad8469fede945bdb62fdf\nLinux Linux 6.4.16\nLinux Linux 6.5.3\nLinux Linux 6.6",
    "sourceHref": "",
    "cvss": {
        "score": 8.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "a0bfde167b506423111ddb8cd71930497a40fc54",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}