netfilter: xt_nat: reject unsupported target families

{
  "id": "788b048d09dabe80a381f8dab027a7829fe8887e14a85a7fe5e976d2937bc4ad",
  "url": "https://osv.dev/vulnerability/CVE-2026-80664",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: xt_nat: reject unsupported target families",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nat: reject unsupported target families xt_nat SNAT and DNAT target handlers assume IP-family conntrack state is present and can dereference a NULL pointer when instantiated from an unsupported family through nft_compat. A bridge-family compat rule can therefore trigger a NULL-dereference in nf_nat_setup_info(). Reject non-IP families in xt_nat_checkentry() so unsupported targets cannot be installed. Keep NFPROTO_INET allowed for valid inet NAT compat users and leave the runtime fast path unchanged. [ The crash was fixed via 9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"), so this patch is no longer critical. Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra family check is a good idea in any case. ]",
    "evidence": "osv:CVE-2026-80664",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.261",
            "evidence": "/affected/1/ranges"
          },
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-80664",
      "aliases": [
        "CVE-2026-80664"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H"
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                  "fixed": "4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:24.186225351Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82",
        "https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4",
        "https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777",
        "https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd",
        "https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902",
        "https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf",
        "https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16",
        "https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80664.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80664",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80664.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80664",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490751,
  "published_at": "2026-08-28T06:49:07.478+00:00"
}