CVE-2026-80664

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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. ]

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity73% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 29, 2026

Advisory Details (8)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82
generic

netfilter: xt_nat: reject unsupported target families - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4

Vendor Advisories for CVE-2026-80664(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 12× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 19:18 UTCEG score recompute
  3. 2026-08-29 19:18 UTCGHSA enrichment
  4. 2026-08-29 07:26 UTCEG score recompute
  5. 2026-08-29 07:26 UTCGHSA enrichment
  6. 2026-08-29 06:36 UTCEG score recompute▲ 7.30
  7. 2026-08-29 06:36 UTCGHSA enrichment
  8. 2026-08-29 06:33 UTCMITRE cvelistV5CVSS v3 → 7.3 · severity → HIGH
  9. 2026-08-28 21:42 UTCEPSS rescore
  10. 2026-08-28 08:20 UTCNVD update
  11. 2026-08-28 07:34 UTCEG score recompute
  12. 2026-08-28 07:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-80664?
CVE-2026-80664 is a high vulnerability published on August 28, 2026. 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…
When was CVE-2026-80664 disclosed?
CVE-2026-80664 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-80664 actively exploited?
CVE-2026-80664 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.3% of all scored CVEs.
What is the CVSS score of CVE-2026-80664?
CVE-2026-80664 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-80664?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80664, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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