Bluetooth: RFCOMM: validate skb length in MCC handlers_CVE-2026-53254

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: validate skb length in MCC handlers\n\nThe RFCOMM MCC handlers cast skb->data to protocol-specific structs\nwithout validating skb->len first. A malicious remote device can send\ntruncated MCC frames and trigger out-of-bounds reads in these handlers.\n\nFix this by using skb_pull_data() to validate and access the required\ndata before dereferencing it.\n\nrfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows\n1-byte RPN requests. Handle this by validating only the DLCI byte first,\nand validating the full struct only when len > 1.",
    "published": "2026-06-25T08:39:45.273Z",
    "modified": "2026-06-28T06:40:59.075Z",
    "type": "cve",
    "title": "Bluetooth: RFCOMM: validate skb length in MCC handlers",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254\nhttps://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef\nhttps://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079e\nhttps://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c\nhttps://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392\nhttps://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997\nhttps://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b",
    "id": "CVE-2026-53254",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 2.6.12",
    "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"
    },
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        "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
    "vendor": "Linux",
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    "ai_score": 0
}