net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback_CVE-2026-43057

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: correctly handle tunneled traffic on IPV6_CSUM GSO fallback\n\nNETIF_F_IPV6_CSUM only advertises support for checksum offload of\npackets without IPv6 extension headers. Packets with extension\nheaders must fall back onto software checksumming. Since TSO\ndepends on checksum offload, those must revert to GSO.\n\nThe below commit introduces that fallback. It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path.",
    "published": "2026-05-01T14:15:49.551Z",
    "modified": "2026-05-03T05:46:27.947Z",
    "type": "cve",
    "title": "net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b\nhttps://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea\nhttps://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c\nhttps://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6\nhttps://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42\nhttps://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5",
    "id": "CVE-2026-43057",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a0478d7e888028f85fa7785ea838ce0ca09398e2\nLinux Linux 2156d9e9f2e483c8c3906c0ea57ea312c1424235\nLinux Linux 041e2f945f82fdbd6fff577b79c33469430297aa\nLinux Linux 864e3396976ef41de6cc7bc366276bf4e084fff2\nLinux Linux 864e3396976ef41de6cc7bc366276bf4e084fff2\nLinux Linux 864e3396976ef41de6cc7bc366276bf4e084fff2\nLinux Linux 794ddbb7b63b6828c75967b9bcd43b086716e7a1\nLinux Linux 6.17",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "a0478d7e888028f85fa7785ea838ce0ca09398e2",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}