netfilter: nf_conncount: increase the connection clean up limit to 64_CVE-2026-45860

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: increase the connection clean up limit to 64\n\nAfter the optimization to only perform one GC per jiffy, a new problem\nwas introduced. If more than 8 new connections are tracked per jiffy the\nlist won't be cleaned up fast enough possibly reaching the limit\nwrongly.\n\nIn order to prevent this issue, only skip the GC if it was already\ntriggered during the same jiffy and the increment is lower than the\nclean up limit. In addition, increase the clean up limit to 64\nconnections to avoid triggering GC too often and do more effective GCs.\n\nThis has been tested using a HTTP server and several\nperformance tools while having nft_connlimit/xt_connlimit or OVS limit\nconfigured.\n\nOutput of slowhttptest + OVS limit at 52000 connections:\n\n slow HTTP test status on 340th second:\n initializing:        0\n pending:             432\n connected:           51998\n error:               0\n closed:              0\n service available:   YES",
    "published": "2026-05-27T12:15:40.080Z",
    "modified": "2026-05-30T10:45:37.644Z",
    "type": "cve",
    "title": "netfilter: nf_conncount: increase the connection clean up limit to 64",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/a5c9e14e0e8923218ae881d5e78c990c07694966\nhttps://git.kernel.org/stable/c/13eede458fdf231f1bf96a398feea4ad1553f14c\nhttps://git.kernel.org/stable/c/fa85432d58c8e74b39333edbf8d28df2985dfc79\nhttps://git.kernel.org/stable/c/0792ad077d776c2dcf20f0484e2461ded1b77a24\nhttps://git.kernel.org/stable/c/3d0994ed0aa1fc0a2c5e620b765e8defdd021bff\nhttps://git.kernel.org/stable/c/6e5fa7add3e76da068a478d905be64be8fa4e80a\nhttps://git.kernel.org/stable/c/0af0812baf2d363176c9b76fc07e33f13aede8db\nhttps://git.kernel.org/stable/c/21d033e472735ecec677f1ae46d6740b5e47a4f3",
    "id": "CVE-2026-45860",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux f106694733c66a48740c25bc4e212e9b2ea364ce\nLinux Linux be69850b461e7b491d87a22e33ab76fdd04b725e\nLinux Linux d265929930e2ffafc744c0ae05fb70acd53be1ee\nLinux Linux d265929930e2ffafc744c0ae05fb70acd53be1ee\nLinux Linux d265929930e2ffafc744c0ae05fb70acd53be1ee\nLinux Linux d265929930e2ffafc744c0ae05fb70acd53be1ee\nLinux Linux d265929930e2ffafc744c0ae05fb70acd53be1ee\nLinux Linux d265929930e2ffafc744c0ae05fb70acd53be1ee\nLinux Linux 5.10.248\nLinux Linux 5.15.198\nLinux Linux 5.19",
    "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": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "f106694733c66a48740c25bc4e212e9b2ea364ce",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}