{
  "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-2026-53012",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53012",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-24T16:29:22.973Z",
    "updatedAt": "2026-10-15T01:22:18.192Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "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": "nexthop: fix IPv6 route referencing IPv4 nexthop",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: fix IPv6 route referencing IPv4 nexthop\n\nsyzbot reported a panic [1] [2].\n\nWhen an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag\nof all groups containing this nexthop is not updated. This is because\nnh_group_v4_update is only called when replacing AF_INET to AF_INET6,\nbut the reverse direction (AF_INET6 to AF_INET) is missed.\n\nThis allows a stale has_v4=false to bypass fib6_check_nexthop, causing\nIPv6 routes to be attached to groups that effectively contain only AF_INET\nmembers. Subsequent route lookups then call nexthop_fib6_nh() which\nreturns NULL for the AF_INET member, leading to a NULL pointer\ndereference.\n\nFix by calling nh_group_v4_update whenever the family changes, not just\nAF_INET to AF_INET6.\n\nReproducer:\n\t# AF_INET6 blackhole\n\tip -6 nexthop add id 1 blackhole\n\t# group with has_v4=false\n\tip nexthop add id 100 group 1\n\t# replace with AF_INET (no -6), has_v4 stays false\n\tip nexthop replace id 1 blackhole\n\t# pass stale has_v4 check\n\tip -6 route add 2001:db8::/64 nhid 100\n\t# panic\n\tping -6 2001:db8::1\n\n[1] https://syzkaller.appspot.com/bug?id=e17283eb2f8dcf3dd9b47fe6f67a95f71faadad0\n[2] https://syzkaller.appspot.com/bug?id=8699b6ae54c9f35837d925686208402949e12ef3",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ceffe81a0be92afc0cd1340bc8ca46559cce9bb4"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9c2d6770a5f4545a307eb66979bef7656a34d621"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "aaac3bed034239e1d75732211d9b05f30b0b4f35"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad85961004fd4bd2f31209ac4b07612c6cefb9e7"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "613c8f4a501421dd258b07ea614205d4e16ec845"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b3b7e850e1541f0520c4a12ec884255c30427ff6"
            },
            {
              "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "29c95185ba32b621fbc3800fb86e7dc3edf5c2be"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.3",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.3"
            },
            {
              "version": "5.10.258",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.175",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.141",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.91",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.33",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}