CVE-2026-72248

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, 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: 1%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: support IPIP tunnel with direct xmit

The combination of IPIP tunnel with direct xmit, eg. bridge device, breaks because no dst_entry is provided to check the skb headroom and to set the iph->frag_off field. This leads to invalid dst usage and can trigger a crash in the tunnel transmit path.

Fix this by moving dst_cache and dst_cookie out of the runtime union so that they can be shared by neighbour, xfrm, and direct tunnel flows. For FLOW_OFFLOAD_XMIT_DIRECT tuples carrying tunnel metadata, preserve route state in these shared fields and release it through the common dst release path.

Since dst_entry is now available to the three supported xmit modes and dst_release() already deals with NULL dst, remove the xmit type check in nft_flow_dst_release(). Moreover, skip the check if the dst entry is NULL in nf_flow_dst_check() which is now the case for the direct xmit case.

Based on patch from Rein Wei .

CVSS v3
9.8
EG Score
9.8(high)
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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (2)

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

netfilter: flowtable: support IPIP tunnel with direct xmit - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fa7395c02d95e51bad2952325d2d6503bfbad437
generic

netfilter: flowtable: support IPIP tunnel with direct xmit - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0880c4ed122d0cddc9f29a2b28f055d1f24f0fca

Vendor Advisories for CVE-2026-72248(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 47× in last 7d / 47× 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 04:47 UTCGHSA enrichment
  2. 2026-08-21 00:34 UTCEG score recompute
  3. 2026-08-21 00:34 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 20:22 UTCGHSA enrichment
  6. 2026-08-20 16:09 UTCGHSA enrichment
  7. 2026-08-20 11:54 UTCGHSA enrichment
  8. 2026-08-20 07:39 UTCGHSA enrichment
  9. 2026-08-20 03:26 UTCGHSA enrichment
  10. 2026-08-19 23:13 UTCGHSA enrichment
  11. 2026-08-19 19:00 UTCEG score recompute
  12. 2026-08-19 19:00 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 14:47 UTCGHSA enrichment
  15. 2026-08-19 10:34 UTCGHSA enrichment
  16. 2026-08-19 06:20 UTCGHSA enrichment
  17. 2026-08-19 01:50 UTCGHSA enrichment
  18. 2026-08-18 21:37 UTCGHSA enrichment
  19. 2026-08-18 17:00 UTCEG score recompute
  20. 2026-08-18 17:00 UTCGHSA enrichment
  21. 2026-08-18 13:49 UTCEPSS rescore
  22. 2026-08-18 13:49 UTCEPSS rescore
  23. 2026-08-18 11:56 UTCGHSA enrichment
  24. 2026-08-18 07:43 UTCGHSA enrichment
  25. 2026-08-18 03:27 UTCGHSA enrichment
Show 22 more
  1. 2026-08-17 23:13 UTCGHSA enrichment
  2. 2026-08-17 19:00 UTCGHSA enrichment
  3. 2026-08-17 14:46 UTCEG score recompute
  4. 2026-08-17 14:46 UTCGHSA enrichment
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-17 10:34 UTCEG score recompute
  7. 2026-08-17 10:34 UTCGHSA enrichment
  8. 2026-08-17 06:20 UTCEG score recompute
  9. 2026-08-17 06:20 UTCGHSA enrichment
  10. 2026-08-17 05:59 UTCEG score recompute▲ 9.80
  11. 2026-08-17 05:59 UTCGHSA enrichment
  12. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  13. 2026-08-17 05:31 UTCEG score recompute
  14. 2026-08-17 05:31 UTCGHSA enrichment
  15. 2026-08-17 05:24 UTCMITRE cvelistV5
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:15 UTCEPSS rescore
  19. 2026-08-15 06:39 UTCGHSA enrichment
  20. 2026-08-15 06:23 UTCNVD update
  21. 2026-08-15 06:09 UTCEG score recompute
  22. 2026-08-15 06:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72248?
CVE-2026-72248 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: support IPIP tunnel with direct xmit The combination of IPIP tunnel with direct xmit, eg. bridge device, breaks because no dst_entry is provided to check the skb headroom and to set the iph->frag_off field.…
When was CVE-2026-72248 disclosed?
CVE-2026-72248 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-2026-72248 actively exploited?
CVE-2026-72248 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 58.2% of all scored CVEs.
What is the CVSS score of CVE-2026-72248?
CVE-2026-72248 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-72248?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72248, 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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