netfilter: ip6t_hbh: reject oversized option lists_CVE-2026-52915

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_hbh: reject oversized option lists\n\nstruct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors,\nbut hbh_mt6_check() does not reject larger optsnr values supplied from\nuserspace.\n\nValidate optsnr in the rule setup path so only match data that fits the\nfixed-size opts array can be installed. This follows the existing xtables\npattern of rejecting invalid user-provided counts in checkentry() and\nkeeps the packet matching path unchanged.\n\n`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,\nwhere `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:\n\n[  137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29\n[  137.926167][ T8692] index 16 is out of range for type '__u16 [16]'",
    "published": "2026-06-24T07:14:12.569Z",
    "modified": "2026-06-28T06:36:33.329Z",
    "type": "cve",
    "title": "netfilter: ip6t_hbh: reject oversized option lists",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02\nhttps://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3\nhttps://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39\nhttps://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e\nhttps://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93\nhttps://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412\nhttps://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7\nhttps://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8",
    "id": "CVE-2026-52915",
    "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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 2.6.12",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}