CVE-2026-68299

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-10. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: 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:

vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets

vmxnet3_get_hdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the outer header, but for a Geneve-encapsulated packet the device can set them based on the inner header instead, signalled by the VMXNET3_RCD_HDR_INNER_SHIFT bit in the completion descriptor. Since the function never skips the outer encapsulation, this mismatch triggers:

  • BUG_ON(hdr.ipv4->protocol != IPPROTO_TCP), because the outer
protocol is UDP (Geneve), not TCP.
  • BUG_ON(hdr.eth->h_proto != ...), when the tunnel's outer and inner
IP versions differ (e.g. outer IPv6/inner IPv4 or vice versa).

Check VMXNET3_RCD_HDR_INNER_SHIFT up front and bail out, since the function cannot locate the inner header it would need to parse. Also convert the remaining BUG_ON()s in this function to return 0 defensively.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
41%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 19, 2026

Advisory Details (5)

Auto-updated Aug 14, 2026
No patch confirmed yet.
generic

vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257
generic

vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38
generic

vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29
generic

vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252
generic

vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8

Vendor Advisories for CVE-2026-68299(2)

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 36× 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 04:25 UTCEG score recompute
  2. 2026-08-21 04:25 UTCVendor advisory
  3. 2026-08-21 04:25 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 16:48 UTCGHSA enrichment
  6. 2026-08-20 05:02 UTCGHSA enrichment
  7. 2026-08-19 17:25 UTCEG score recompute
  8. 2026-08-19 17:25 UTCGHSA enrichment
  9. 2026-08-19 17:04 UTCEPSS rescore
  10. 2026-08-19 16:54 UTCEG score recompute
  11. 2026-08-19 16:54 UTCGHSA enrichment
  12. 2026-08-19 05:07 UTCGHSA enrichment
  13. 2026-08-18 17:25 UTCEG score recompute
  14. 2026-08-18 17:25 UTCGHSA enrichment
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 04:51 UTCGHSA enrichment
  18. 2026-08-17 17:14 UTCEG score recompute
  19. 2026-08-17 17:14 UTCGHSA enrichment
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 05:37 UTCEG score recompute
  22. 2026-08-17 05:37 UTCGHSA enrichment
  23. 2026-08-17 05:06 UTCEG score recompute
  24. 2026-08-17 05:06 UTCGHSA enrichment
  25. 2026-08-16 21:28 UTCEG score recompute
Show 22 more
  1. 2026-08-16 21:28 UTCGHSA enrichment
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 09:50 UTCEG score recompute
  4. 2026-08-16 09:50 UTCGHSA enrichment
  5. 2026-08-15 22:14 UTCGHSA enrichment
  6. 2026-08-15 10:37 UTCEG score recompute
  7. 2026-08-15 10:37 UTCGHSA enrichment
  8. 2026-08-15 01:30 UTCEPSS rescore
  9. 2026-08-14 22:59 UTCGHSA enrichment
  10. 2026-08-14 11:22 UTCEG score recompute
  11. 2026-08-14 11:22 UTCGHSA enrichment
  12. 2026-08-13 23:46 UTCEG score recompute
  13. 2026-08-13 23:46 UTCGHSA enrichment
  14. 2026-08-13 22:44 UTCEG score recompute▲ 7.50
  15. 2026-08-13 22:44 UTCGHSA enrichment
  16. 2026-08-13 22:44 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  17. 2026-08-13 12:20 UTCEG score recompute
  18. 2026-08-13 12:20 UTCGHSA enrichment
  19. 2026-08-12 13:51 UTCEPSS rescore
  20. 2026-08-10 13:24 UTCNVD update
  21. 2026-08-10 12:19 UTCEG score recompute
  22. 2026-08-10 12:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-68299?
CVE-2026-68299 is a high vulnerability published on August 10, 2026. In the Linux kernel, the following vulnerability has been resolved: vmxnet3: fix BUGON in vmxnet3gethdrlen() for Geneve packets vmxnet3gethdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the outer header, but for a Geneve-encapsulated packet the device can set them based on the inner header…
When was CVE-2026-68299 disclosed?
CVE-2026-68299 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-68299 actively exploited?
CVE-2026-68299 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 58.7% of all scored CVEs.
What is the CVSS score of CVE-2026-68299?
CVE-2026-68299 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-68299?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-68299, 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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