Bluetooth: hci_conn: fix potential UAF in create_big_sync_CVE-2026-46111

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in create_big_sync\n\nAdd hci_conn_valid() check in create_big_sync() to detect stale\nconnections before proceeding with BIG creation. Handle the\nresulting -ECANCELED in create_big_complete() and re-validate the\nconnection under hci_dev_lock() before dereferencing, matching the\npattern used by create_le_conn_complete() and create_pa_complete().\n\nKeep the hci_conn object alive across the async boundary by taking\na reference via hci_conn_get() when queueing create_big_sync(), and\ndropping it in the completion callback. The refcount and the lock\nare complementary: the refcount keeps the object allocated, while\nhci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on\nhdev->conn_hash, as required by hci_conn_del().\n\nhci_conn_put() is called outside hci_dev_unlock() so the final put\n(which resolves to kfree() via bt_link_release) does not run under\nhdev->lock, though the release path would be safe either way.\n\nWithout this, create_big_complete() would unconditionally\ndereference the conn pointer on error, causing a use-after-free\nvia hci_connect_cfm() and hci_conn_del().",
    "published": "2026-05-28T09:35:19.970Z",
    "modified": "2026-05-30T10:47:42.860Z",
    "type": "cve",
    "title": "Bluetooth: hci_conn: fix potential UAF in create_big_sync",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584\nhttps://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85\nhttps://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142\nhttps://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72\nhttps://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41",
    "id": "CVE-2026-46111",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux eca0ae4aea66914515e5e3098ea051b518ee5316\nLinux Linux eca0ae4aea66914515e5e3098ea051b518ee5316\nLinux Linux eca0ae4aea66914515e5e3098ea051b518ee5316\nLinux Linux eca0ae4aea66914515e5e3098ea051b518ee5316\nLinux Linux eca0ae4aea66914515e5e3098ea051b518ee5316\nLinux Linux 6.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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            "privilegesRequired": "",
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "eca0ae4aea66914515e5e3098ea051b518ee5316",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}