CVE-2026-45860 (GCVE-0-2026-45860)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-05-27 12:15
VLAI
Title
netfilter: nf_conncount: increase the connection clean up limit to 64
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: increase the connection clean up limit to 64 After the optimization to only perform one GC per jiffy, a new problem was introduced. If more than 8 new connections are tracked per jiffy the list won't be cleaned up fast enough possibly reaching the limit wrongly. In order to prevent this issue, only skip the GC if it was already triggered during the same jiffy and the increment is lower than the clean up limit. In addition, increase the clean up limit to 64 connections to avoid triggering GC too often and do more effective GCs. This has been tested using a HTTP server and several performance tools while having nft_connlimit/xt_connlimit or OVS limit configured. Output of slowhttptest + OVS limit at 52000 connections: slow HTTP test status on 340th second: initializing: 0 pending: 432 connected: 51998 error: 0 closed: 0 service available: YES
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f106694733c66a48740c25bc4e212e9b2ea364ce , < a5c9e14e0e8923218ae881d5e78c990c07694966 (git)
Affected: be69850b461e7b491d87a22e33ab76fdd04b725e , < 13eede458fdf231f1bf96a398feea4ad1553f14c (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < fa85432d58c8e74b39333edbf8d28df2985dfc79 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 0792ad077d776c2dcf20f0484e2461ded1b77a24 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 3d0994ed0aa1fc0a2c5e620b765e8defdd021bff (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 6e5fa7add3e76da068a478d905be64be8fa4e80a (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 0af0812baf2d363176c9b76fc07e33f13aede8db (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 21d033e472735ecec677f1ae46d6740b5e47a4f3 (git)
Affected: 5.10.248 , < 5.10.252 (semver)
Affected: 5.15.198 , < 5.15.202 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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            "include/net/netfilter/nf_conntrack_count.h",
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          "value": "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\u0027t 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"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45860",
    "datePublished": "2026-05-27T12:15:40.080Z",
    "dateReserved": "2026-05-13T15:03:33.080Z",
    "dateUpdated": "2026-05-27T12:15:40.080Z",
    "state": "PUBLISHED"
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      "date": "2026-05-29",
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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