{
  "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-2026-72421",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-72421",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-15T05:56:40.466Z",
    "updatedAt": "2026-10-16T18:55:23.102Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "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": "ipv4: fib: Don't ignore error route in local/main tables.",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: Don't ignore error route in local/main tables.\n\nWhen CONFIG_IP_MULTIPLE_TABLES is enabled but no rule is added,\nfib_lookup() performs route lookup directly on two tables.\n\nSince the first lookup does not properly bail out, the result\nof an error route in the merged local/main table could be\noverwritten by another route in the default table:\n\n  # unshare -n\n  # ip link set lo up\n  # ip route add 192.168.0.0/24 dev lo table 253\n  # ip route add unreachable 192.168.0.0/24\n  # ip route get 192.168.0.1\n  192.168.0.1 dev lo table default uid 0\n      cache <local>\n\nOnce a random rule is added, the error route is respected:\n\n  # ip rule add table 0\n  # ip rule del table 0\n  # ip route get 192.168.0.1\n  RTNETLINK answers: No route to host\n\nLet's fix the inconsistent behaviour.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a29e95fbc51e8a1b932773fd0e259b2080881443"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5ae18d87a45698e8244d0fcba64c658c35a7dd3d"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9127589aabdee588278e8d0d0bd3709a760a92c8"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "49eaf1403201357762d745a35882fb734107d763"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fd25996f57a95d56bc568c89b4921edcf334b7d8"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "828fad4fd418bcdb9f5d66fec0d184c52a85ec31"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a668fa160247d7bbe921548cb845f607b8b9305f"
            },
            {
              "version": "f4530fa574df4d833506c53697ed1daa0d390bf4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b72f0db64205d9ce462038ba995d5d31eff32dc1"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.6",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.6"
            },
            {
              "version": "5.10.261",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.212",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.178",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.145",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.97",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.40",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}