netfilter: xt_nat: reject unsupported target families

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80664
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:51 UTC
Updated2026-08-29 07:16:48 UTC
DescriptionIn 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. ]

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

EPSS: 0.001760000 probability, percentile 0.072310000 (date 2026-08-28)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 49abe564391411057a26a9a943c8e17867c3b9b4 git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82 git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777 git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 a842dab87cab29f2a5798a47b2dc5e6a449950bf git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 e35c048d7511e9d4c2a537b8a231c49606e97c16 git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 679ced28a9dc2f6dc679eb05027d779693e60902 git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 ec88fa71c82072e9189983b05b499d3507550271 git Not specified
CNA Linux Linux affected c7232c9979cba684c50b64c513c4a83c9aa70563 5d1a2240935ea47e2673d0ea17fdb058e4dc91dd git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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