Vulnerability-Lookup

GHSA-CF2J-M586-269W

Vulnerability from github – Published: 2026-02-14 18:30 – Updated: 2026-02-14 18:30

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_conncount: update last_gc only when GC has been performed

Currently last_gc is being updated everytime a new connection is tracked, that means that it is updated even if a GC wasn't performed. With a sufficiently high packet rate, it is possible to always bypass the GC, causing the list to grow infinitely.

Update the last_gc value only when a GC has been actually performed.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23139"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-14T16:15:53Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: update last_gc only when GC has been performed\n\nCurrently last_gc is being updated everytime a new connection is\ntracked, that means that it is updated even if a GC wasn\u0027t performed.\nWith a sufficiently high packet rate, it is possible to always bypass\nthe GC, causing the list to grow infinitely.\n\nUpdate the last_gc value only when a GC has been actually performed.",
  "id": "GHSA-cf2j-m586-269w",
  "modified": "2026-02-14T18:30:14Z",
  "published": "2026-02-14T18:30:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23139"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26a82dce2beee39c43c109d9647e16f49cb02a35"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c7c71113ed6d3e2f3aca4c088f22283016ff34f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cd717359e56f82f06cbf8279b47a7d79880c6f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7811ba452402d58628e68faedf38745b3d485e3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bdafdf4900040a81422056cabe5e00a37bd101a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f45588993d7f115280fc726119ca86fba32a811"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4cde57c8affdcca5bcff53a1047e15d268bdca1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23139 (GCVE-0-2026-23139)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:22 – Updated: 2026-02-14 15:22

Title

netfilter: nf_conncount: update last_gc only when GC has been performed

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: update last_gc only when GC has been performed Currently last_gc is being updated everytime a new connection is tracked, that means that it is updated even if a GC wasn't performed. With a sufficiently high packet rate, it is possible to always bypass the GC, causing the list to grow infinitely. Update the last_gc value only when a GC has been actually performed.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/2c7c71113ed6d3e2f…
	https://git.kernel.org/stable/c/c4cde57c8affdcca5…
	https://git.kernel.org/stable/c/9f45588993d7f1152…
	https://git.kernel.org/stable/c/3cd717359e56f82f0…
	https://git.kernel.org/stable/c/26a82dce2beee39c4…
	https://git.kernel.org/stable/c/8bdafdf4900040a81…
	https://git.kernel.org/stable/c/7811ba452402d5862…

Impacted products

Vendor

Product

Version

Linux

Affected: f106694733c66a48740c25bc4e212e9b2ea364ce , < 2c7c71113ed6d3e2f3aca4c088f22283016ff34f (git)
Affected: be69850b461e7b491d87a22e33ab76fdd04b725e , < c4cde57c8affdcca5bcff53a1047e15d268bdca1 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 9f45588993d7f115280fc726119ca86fba32a811 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 3cd717359e56f82f06cbf8279b47a7d79880c6f3 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 26a82dce2beee39c43c109d9647e16f49cb02a35 (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 8bdafdf4900040a81422056cabe5e00a37bd101a (git)
Affected: d265929930e2ffafc744c0ae05fb70acd53be1ee , < 7811ba452402d58628e68faedf38745b3d485e3c (git)

Linux

Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.161 , ≤ 6.1.* (semver)
Unaffected: 6.6.121 , ≤ 6.6.* (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conncount.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2c7c71113ed6d3e2f3aca4c088f22283016ff34f",
              "status": "affected",
              "version": "f106694733c66a48740c25bc4e212e9b2ea364ce",
              "versionType": "git"
            },
            {
              "lessThan": "c4cde57c8affdcca5bcff53a1047e15d268bdca1",
              "status": "affected",
              "version": "be69850b461e7b491d87a22e33ab76fdd04b725e",
              "versionType": "git"
            },
            {
              "lessThan": "9f45588993d7f115280fc726119ca86fba32a811",
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              "versionType": "git"
            },
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              "lessThan": "3cd717359e56f82f06cbf8279b47a7d79880c6f3",
              "status": "affected",
              "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
              "versionType": "git"
            },
            {
              "lessThan": "26a82dce2beee39c43c109d9647e16f49cb02a35",
              "status": "affected",
              "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
              "versionType": "git"
            },
            {
              "lessThan": "8bdafdf4900040a81422056cabe5e00a37bd101a",
              "status": "affected",
              "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
              "versionType": "git"
            },
            {
              "lessThan": "7811ba452402d58628e68faedf38745b3d485e3c",
              "status": "affected",
              "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conncount.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.161",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.121",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.161",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.66",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.6",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: update last_gc only when GC has been performed\n\nCurrently last_gc is being updated everytime a new connection is\ntracked, that means that it is updated even if a GC wasn\u0027t performed.\nWith a sufficiently high packet rate, it is possible to always bypass\nthe GC, causing the list to grow infinitely.\n\nUpdate the last_gc value only when a GC has been actually performed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T15:22:24.059Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2c7c71113ed6d3e2f3aca4c088f22283016ff34f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4cde57c8affdcca5bcff53a1047e15d268bdca1"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f45588993d7f115280fc726119ca86fba32a811"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cd717359e56f82f06cbf8279b47a7d79880c6f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/26a82dce2beee39c43c109d9647e16f49cb02a35"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bdafdf4900040a81422056cabe5e00a37bd101a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7811ba452402d58628e68faedf38745b3d485e3c"
        }
      ],
      "title": "netfilter: nf_conncount: update last_gc only when GC has been performed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23139",
    "datePublished": "2026-02-14T15:22:24.059Z",
    "dateReserved": "2026-01-13T15:37:45.972Z",
    "dateUpdated": "2026-02-14T15:22:24.059Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-CF2J-M586-269W

CVE-2026-23139 (GCVE-0-2026-23139)

Tags

Sightings

Nomenclature