netfilter: ctnetlink: ignore explicit helper on new expectations_CVE-2026-43025

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: ignore explicit helper on new expectations\n\nUse the existing master conntrack helper, anything else is not really\nsupported and it just makes validation more complicated, so just ignore\nwhat helper userspace suggests for this expectation.\n\nThis was uncovered when validating CTA_EXPECT_CLASS via different helper\nprovided by userspace than the existing master conntrack helper:\n\n  BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0\n  Read of size 4 at addr ffff8880043fe408 by task poc/102\n  Call Trace:\n   nf_ct_expect_related_report+0x2479/0x27c0\n   ctnetlink_create_expect+0x22b/0x3b0\n   ctnetlink_new_expect+0x4bd/0x5c0\n   nfnetlink_rcv_msg+0x67a/0x950\n   netlink_rcv_skb+0x120/0x350\n\nAllowing to read kernel memory bytes off the expectation boundary.\n\nCTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace\nvia netlink dump.",
    "published": "2026-05-01T14:15:27.103Z",
    "modified": "2026-05-03T05:46:09.287Z",
    "type": "cve",
    "title": "netfilter: ctnetlink: ignore explicit helper on new expectations",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897\nhttps://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6\nhttps://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd\nhttps://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d\nhttps://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3\nhttps://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a",
    "id": "CVE-2026-43025",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux bd0779370588386e4a67ba5d0b176cfded8e6a53\nLinux Linux bd0779370588386e4a67ba5d0b176cfded8e6a53\nLinux Linux bd0779370588386e4a67ba5d0b176cfded8e6a53\nLinux Linux bd0779370588386e4a67ba5d0b176cfded8e6a53\nLinux Linux bd0779370588386e4a67ba5d0b176cfded8e6a53\nLinux Linux bd0779370588386e4a67ba5d0b176cfded8e6a53\nLinux Linux 3.12",
    "sourceHref": "",
    "cvss": {
        "score": 7.3,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_score": 0
}