CVE-2026-64410

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: 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: flowtable: IPIP tunnel hardware offload is not yet support

No driver supports for IPIP tunnels yet, give up early on setting up the hardware offload for this scenario.

This patch adds a stub that can be enhanced to add more configuration that are currently not supported. As of now, the offload work is enqueued to the worker, then ignored if the hardware offload configuration is not supported.

Check the NF_FLOW_HW flag to know if this entry was already tried once to be offloaded so this is not retried on refresh when unsupported. Move NF_FLOW_HW flag check to nf_flow_offload_add(). If this NF_FLOW_HW flag is unset the _del and _stats variants are never called.

This can be updated later on to skip hardware offload work to be queued in case hardware offload does not support it.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 25, 2026

Last Modified

July 27, 2026

Advisory Details (2)

Auto-updated Jul 27, 2026
No patch confirmed yet.
generic

netfilter: flowtable: IPIP tunnel hardware offload is not yet support - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9efe838c13133acb70c78d04c49e8362fe533566
generic

netfilter: flowtable: IPIP tunnel hardware offload is not yet support - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6c5dcab95f4cd42a1648739ec9300fbb4b1a021f

Vendor Advisories for CVE-2026-64410(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 14× in last 7d / 14× 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. 2026-07-27 05:28 UTCEG score recompute
  2. 2026-07-27 05:28 UTCGHSA enrichment
  3. 2026-07-27 05:15 UTCEG score recompute▲ 9.80
  4. 2026-07-27 05:15 UTCGHSA enrichment
  5. 2026-07-27 05:12 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 02:48 UTCEG score recompute
  9. 2026-07-26 02:48 UTCGHSA enrichment
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-25 14:18 UTCEPSS rescore
  12. 2026-07-25 10:39 UTCNVD update
  13. 2026-07-25 09:30 UTCEG score recompute
  14. 2026-07-25 09:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-64410?
CVE-2026-64410 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: IPIP tunnel hardware offload is not yet support No driver supports for IPIP tunnels yet, give up early on setting up the hardware offload for this scenario. This patch adds a stub that can be enhanced to add…
When was CVE-2026-64410 disclosed?
CVE-2026-64410 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64410 actively exploited?
CVE-2026-64410 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 94.8% of all scored CVEs.
What is the CVSS score of CVE-2026-64410?
CVE-2026-64410 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64410?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64410, 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.

Dependency Blast Radius

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