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

Vulnerability from cvelistv5 – Published: 2026-02-14 15:22 – Updated: 2026-02-14 15:22
VLAI?
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
References
Impacted products
Vendor Product Version
Linux 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)
Create a notification for this product.
    Linux 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)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "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",
              "status": "affected",
              "version": "d265929930e2ffafc744c0ae05fb70acd53be1ee",
              "versionType": "git"
            },
            {
              "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:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.121",
                  "versionStartIncluding": "5.19",
                  "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"
      }
    }
  },
  "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",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23139\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T16:15:53.950\",\"lastModified\":\"2026-02-14T16:15:53.950\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/26a82dce2beee39c43c109d9647e16f49cb02a35\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2c7c71113ed6d3e2f3aca4c088f22283016ff34f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cd717359e56f82f06cbf8279b47a7d79880c6f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7811ba452402d58628e68faedf38745b3d485e3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bdafdf4900040a81422056cabe5e00a37bd101a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f45588993d7f115280fc726119ca86fba32a811\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4cde57c8affdcca5bcff53a1047e15d268bdca1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.