CVE-2026-80664 (GCVE-0-2026-80664)
Vulnerability from cvelistv5
Published
2026-08-28 06:49
Modified
2026-10-16 19:26
Severity ?
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
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. ]
References
Impacted products
Vendor Product Version
Linux Linux Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
Version: c7232c9979cba684c50b64c513c4a83c9aa70563
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A bridge-family compat rule can\\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\\n\\nReject non-IP families in xt_nat_checkentry() so unsupported targets\\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\\ncompat users and leave the runtime fast path unchanged.\\n\\n[ The crash was fixed via\\n  9dbba7e694ec (\\\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\\\"),\\n  so this patch is no longer critical.\\n  Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra\\n  family check is a good idea in any case. ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-29T06:21:50.580Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80664\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:26:32.191Z\", \"dateReserved\": \"2026-08-26T14:34:25.781Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-28T06:49:07.478Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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