CVE-2026-72348

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: 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: ip6tables: mark malformed IPv6 extension headers for hotdrop

The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length for matching.

For the ah match, add the missing advertised-length check. For hbh and rt, update the existing advertised-length checks. In all three cases, set hotdrop to true before returning false when the advertised extension header length exceeds the available skb data.

Returning false treats the packet as a rule mismatch. Set hotdrop to true and drop malformed packets so they cannot bypass rules intended to drop packets with these IPv6 extension headers.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc416870100cf16d5b9495199355a679c3a02d48
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f775fcf384b06f35b612f78fa5601fee99eb6513
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f16d856b6af5fd0e7cb0b0212f70825b599ef72e
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/43ccc20b5a733226417832cf16ef45322e594990
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3d441be2b1c5e98167302fa1c7b61960a067b112
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3578b6d92a5b1e603ae6e8c8f5538a709f03aba4
generic

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2fd89a50a9783eed8ed23866b11c8b3d8779a7a8

Vendor Advisories for CVE-2026-72348(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 49× in last 7d / 49× 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. 2026-08-21 06:03 UTCGHSA enrichment
  2. 2026-08-21 02:06 UTCEG score recompute
  3. 2026-08-21 02:06 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 22:09 UTCGHSA enrichment
  6. 2026-08-20 18:13 UTCGHSA enrichment
  7. 2026-08-20 14:17 UTCGHSA enrichment
  8. 2026-08-20 10:21 UTCGHSA enrichment
  9. 2026-08-20 06:25 UTCGHSA enrichment
  10. 2026-08-20 02:29 UTCGHSA enrichment
  11. 2026-08-19 22:32 UTCGHSA enrichment
  12. 2026-08-19 18:35 UTCEG score recompute
  13. 2026-08-19 18:35 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 14:38 UTCGHSA enrichment
  16. 2026-08-19 10:42 UTCGHSA enrichment
  17. 2026-08-19 06:46 UTCGHSA enrichment
  18. 2026-08-19 02:48 UTCGHSA enrichment
  19. 2026-08-18 22:50 UTCGHSA enrichment
  20. 2026-08-18 18:54 UTCGHSA enrichment
  21. 2026-08-18 14:58 UTCEG score recompute
  22. 2026-08-18 14:58 UTCGHSA enrichment
  23. 2026-08-18 13:49 UTCEPSS rescore
  24. 2026-08-18 13:49 UTCEPSS rescore
  25. 2026-08-18 10:47 UTCGHSA enrichment
Show 24 more
  1. 2026-08-18 06:50 UTCGHSA enrichment
  2. 2026-08-18 02:53 UTCGHSA enrichment
  3. 2026-08-17 22:56 UTCGHSA enrichment
  4. 2026-08-17 18:59 UTCGHSA enrichment
  5. 2026-08-17 14:22 UTCEG score recompute
  6. 2026-08-17 14:22 UTCGHSA enrichment
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-17 10:25 UTCEG score recompute
  9. 2026-08-17 10:25 UTCGHSA enrichment
  10. 2026-08-17 06:29 UTCEG score recompute
  11. 2026-08-17 06:29 UTCGHSA enrichment
  12. 2026-08-17 05:58 UTCEG score recompute▲ 9.10
  13. 2026-08-17 05:58 UTCGHSA enrichment
  14. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  15. 2026-08-17 05:30 UTCEG score recompute
  16. 2026-08-17 05:30 UTCGHSA enrichment
  17. 2026-08-17 05:25 UTCMITRE cvelistV5
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 02:15 UTCEPSS rescore
  21. 2026-08-15 06:36 UTCGHSA enrichment
  22. 2026-08-15 06:23 UTCNVD update
  23. 2026-08-15 06:06 UTCEG score recompute
  24. 2026-08-15 06:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72348?
CVE-2026-72348 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length…
When was CVE-2026-72348 disclosed?
CVE-2026-72348 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72348 actively exploited?
CVE-2026-72348 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.7% of all scored CVEs.
What is the CVSS score of CVE-2026-72348?
CVE-2026-72348 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-72348?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72348, 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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