---
id: CVE-2026-80664
title: |-
  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 point…
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 point…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H'
published: '2026-08-28'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80664'
references:
  - url: 'https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00174
epssPercentile: 0.06027
ingestedAt: '2026-08-30T04:47:09.915Z'
---

## Overview

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. ]

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.