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netfilter: nf_conncount: increase the connection clean up limit to 64

Type: advisorySource: Official CVE List1 source record

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

Announced Group revision 1
Original source ↗

CVE-2026-45860

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-45860

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f106694733c66a48740c25bc4e212e9b2ea364ce",
        "lessThan": "a5c9e14e0e8923218ae881d5e78c990c07694966",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be69850b461e7b491d87a22e33ab76fdd04b725e",
        "lessThan": "13eede458fdf231f1bf96a398feea4ad1553f14c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
        "lessThan": "fa85432d58c8e74b39333edbf8d28df2985dfc79",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "0792ad077d776c2dcf20f0484e2461ded1b77a24",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "3d0994ed0aa1fc0a2c5e620b765e8defdd021bff",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "6e5fa7add3e76da068a478d905be64be8fa4e80a",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "0af0812baf2d363176c9b76fc07e33f13aede8db",
        "versionType": "git"
      },
      {
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        "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
        "lessThan": "21d033e472735ecec677f1ae46d6740b5e47a4f3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.248",
        "lessThan": "5.10.252",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.198",
        "lessThan": "5.15.202",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "include/net/netfilter/nf_conntrack_count.h",
      "net/netfilter/nf_conncount.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.252",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.202",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.165",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.128",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.75",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/netfilter/nf_conntrack_count.h",
      "net/netfilter/nf_conncount.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-45860

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40091 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-45860 · Revision 1Source updated