net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler_CVE-2026-43495

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. A modem sending port_count=65535 in a 12-byte\nbuffer triggers a slab-out-of-bounds read of up to 262140 bytes.\n\nAdd a sizeof(*port_msg) check before accessing the port message header\nfields to guard against undersized messages.\n\nAdd a struct_size() check after extracting port_count and before the loop.\n\nIn t7xx_parse_host_rt_data(), guard the rt_feature header read with a\nremaining-buffer check before accessing data_len, validate feat_data_len\nagainst the actual remaining buffer to prevent OOB reads and signed\ninteger overflow on offset.\n\nPass msg_len from both call sites: skb->len at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path.",
    "published": "2026-05-21T12:12:45.988Z",
    "modified": "2026-05-30T10:45:12.397Z",
    "type": "cve",
    "title": "net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf\nhttps://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202\nhttps://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513c\nhttps://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1\nhttps://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744",
    "id": "CVE-2026-43495",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux da45d2566a1d4e260b894ff5d96be64b21c7fa79\nLinux Linux da45d2566a1d4e260b894ff5d96be64b21c7fa79\nLinux Linux da45d2566a1d4e260b894ff5d96be64b21c7fa79\nLinux Linux da45d2566a1d4e260b894ff5d96be64b21c7fa79\nLinux Linux da45d2566a1d4e260b894ff5d96be64b21c7fa79\nLinux Linux 5.19",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:A/AC:L/PR:N/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,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}