netfilter: x_tables: guard option walkers against 1-byte tail reads_CVE-2026-43452

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: guard option walkers against 1-byte tail reads\n\nWhen the last byte of options is a non-single-byte option kind, walkers\nthat advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end\nof the option area.\n\nAdd an explicit i == optlen - 1 check before dereferencing op[i + 1]\nin xt_tcpudp and xt_dccp option walkers.",
    "published": "2026-05-08T14:22:17.361Z",
    "modified": "2026-05-11T06:34:38.106Z",
    "type": "cve",
    "title": "netfilter: x_tables: guard option walkers against 1-byte tail reads",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a\nhttps://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823\nhttps://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907\nhttps://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540\nhttps://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c\nhttps://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5\nhttps://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36\nhttps://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4",
    "id": "CVE-2026-43452",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc\nLinux Linux 2.6.16",
    "sourceHref": "",
    "cvss": {
        "score": 8.2,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}