netfilter: conntrack: add missing netlink policy validations_CVE-2026-31407

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n  nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n  value directly to ct->proto.sctp.state without checking that it is\n  within the valid range. [..]\n\n  and: ... with exp->dir = 100, the access at\n  ct->master->tuplehash[100] reads 5600 bytes past the start of a\n  320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n  UBSAN.",
    "published": "2026-04-06T07:38:19.712Z",
    "modified": "2026-04-27T14:02:54.741Z",
    "type": "cve",
    "title": "netfilter: conntrack: add missing netlink policy validations",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c\nhttps://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443\nhttps://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e\nhttps://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d\nhttps://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05",
    "id": "CVE-2026-31407",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a258860e01b80e8f554a4ab1a6c95e6042eb8b73\nLinux Linux a258860e01b80e8f554a4ab1a6c95e6042eb8b73\nLinux Linux a258860e01b80e8f554a4ab1a6c95e6042eb8b73\nLinux Linux a258860e01b80e8f554a4ab1a6c95e6042eb8b73\nLinux Linux a258860e01b80e8f554a4ab1a6c95e6042eb8b73\nLinux Linux 2.6.27",
    "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": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}