GHSA-4WGJ-9QHP-2583
Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-29 09:30In 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. ]
{
"affected": [],
"aliases": [
"CVE-2026-80664"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-28T08:16:51Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nat: reject unsupported target families\n\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. 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. ]",
"id": "GHSA-4wgj-9qhp-2583",
"modified": "2026-08-29T09:30:27Z",
"published": "2026-08-28T09:31:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80664"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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