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

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-08-05 12:28
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/net/netfilter/nf_conntrack_count.h\",\"net/netfilter/nf_conncount.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f106694733c66a48740c25bc4e212e9b2ea364ce\",\"lessThan\":\"a5c9e14e0e8923218ae881d5e78c990c07694966\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"be69850b461e7b491d87a22e33ab76fdd04b725e\",\"lessThan\":\"13eede458fdf231f1bf96a398feea4ad1553f14c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d265929930e2ffafc744c0ae05fb70acd53be1ee\",\"lessThan\":\"fa85432d58c8e74b39333edbf8d28df2985dfc79\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d265929930e2ffafc744c0ae05fb70acd53be1ee\",\"lessThan\":\"0792ad077d776c2dcf20f0484e2461ded1b77a24\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d265929930e2ffafc744c0ae05fb70acd53be1ee\",\"lessThan\":\"3d0994ed0aa1fc0a2c5e620b765e8defdd021bff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d265929930e2ffafc744c0ae05fb70acd53be1ee\",\"lessThan\":\"6e5fa7add3e76da068a478d905be64be8fa4e80a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d265929930e2ffafc744c0ae05fb70acd53be1ee\",\"lessThan\":\"0af0812baf2d363176c9b76fc07e33f13aede8db\",\"versionType\":\"git\",\"status\":\"affected\"},{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/net/netfilter/nf_conntrack_count.h\",\"net/netfilter/nf_conncount.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.14\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.248\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"0FF383F2-E238-49E9-870A-004DCE6EC4EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.198\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"3E8A14C6-5AE2-428C-8575-4BA8348BC6C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.19\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"3DD2C202-0D8D-4C7D-A980-CFCF610F7707\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.14\",\"matchCriteriaId\":\"BF463CB7-1F58-4607-B847-77ED23E4B9B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.4\",\"matchCriteriaId\":\"672A3E79-EC03-479D-8503-361DFBDC8092\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0792ad077d776c2dcf20f0484e2461ded1b77a24\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0af0812baf2d363176c9b76fc07e33f13aede8db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/13eede458fdf231f1bf96a398feea4ad1553f14c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/21d033e472735ecec677f1ae46d6740b5e47a4f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3d0994ed0aa1fc0a2c5e620b765e8defdd021bff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6e5fa7add3e76da068a478d905be64be8fa4e80a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a5c9e14e0e8923218ae881d5e78c990c07694966\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fa85432d58c8e74b39333edbf8d28df2985dfc79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:51:10+00:00",
      "cve": "CVE-2026-45860",
      "id": "CVE-2026-45860",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_conncount: increase the connection clean up limit to 64",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45860.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-18T00:11:49Z",
      "cve": "CVE-2026-45860",
      "id": "CVE-2026-45860",
      "initial_release_date": "2026-05-28T03:57:20Z",
      "product_status:first_fixed": "98",
      "product_status:known_affected": "114",
      "product_status:known_not_affected": "181",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45860",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45860.json",
      "version": "6"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.