{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-38721",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-38721",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-04T15:33:14.891Z",
    "updatedAt": "2026-10-15T01:07:46.191Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "netfilter: ctnetlink: fix refcount leak on table dump",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: fix refcount leak on table dump\n\nThere is a reference count leak in ctnetlink_dump_table():\n      if (res < 0) {\n                nf_conntrack_get(&ct->ct_general); // HERE\n                cb->args[1] = (unsigned long)ct;\n                ...\n\nWhile its very unlikely, its possible that ct == last.\nIf this happens, then the refcount of ct was already incremented.\nThis 2nd increment is never undone.\n\nThis prevents the conntrack object from being released, which in turn\nkeeps prevents cnet->count from dropping back to 0.\n\nThis will then block the netns dismantle (or conntrack rmmod) as\nnf_conntrack_cleanup_net_list() will wait forever.\n\nThis can be reproduced by running conntrack_resize.sh selftest in a loop.\nIt takes ~20 minutes for me on a preemptible kernel on average before\nI see a runaway kworker spinning in nf_conntrack_cleanup_net_list.\n\nOne fix would to change this to:\n        if (res < 0) {\n\t\tif (ct != last)\n\t                nf_conntrack_get(&ct->ct_general);\n\nBut this reference counting isn't needed in the first place.\nWe can just store a cookie value instead.\n\nA followup patch will do the same for ctnetlink_exp_dump_table,\nit looks to me as if this has the same problem and like\nctnetlink_dump_table, we only need a 'skip hint', not the actual\nobject so we can apply the same cookie strategy there as well.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "586892e341fbf698e7cbaca293e1353957db725a"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "962518c6ca9f9a13df099cafa429f72f68ad61f0"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "19b909a4b1452fb97e477d2f08b97f8d04095619"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "41462f4cfc583513833f87f9ee55d12da651a7e3"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "30cf811058552b8cd0e98dff677ef3f89d6d34ce"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a2cb4df7872de069f809de2f076ec8e54d649fe3"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e14f72aa66c029db106921d621edcedef68e065b"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a62d6aa3f31f216b637a4c71b7a8bfc7c57f049b"
            },
            {
              "version": "d205dc40798d97d63ad348bfaf7394f445d152d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "de788b2e6227462b6dcd0e07474e72c089008f74"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.18"
            },
            {
              "version": "5.4.297",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.241",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.190",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.149",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.103",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.43",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.15.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.15.*"
            },
            {
              "version": "6.16.2",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "version": "6.17",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}