CVE-2026-68299

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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 — Patch released 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: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 10, 2026

Last Modified

August 19, 2026

Advisory Details (5)

Auto-updated Aug 14, 2026
Patch available.
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(5)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-rt-0:4.18.0-553.170.1.rt7.511.el8_102026-09-30redhat
redhatkernel-0:4.18.0-553.170.1.el8_102026-09-30redhat
redhatkernel-0:6.12.0-211.61.1.el10_22026-09-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)
  • every version up to 6.1.187-1: fixed in 6.1.187-1
—
linux-6.126.12.100-1~deb12u1
  • every version up to 6.12.101-1~deb12u1: fixed in 6.12.101-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (32 versions)
  • every version up to 6.12.101-1: fixed in 6.12.101-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (161 versions)
  • every version up to 7.1.6-1: fixed in 7.1.6-1
—

Data Freshness Timeline

(refreshed 24× in last 7d / 131× 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.

Showing the most recent 100 of 256 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 22:51 UTCVendor advisory
  3. 2026-10-04 22:51 UTCGHSA enrichment
  4. 2026-10-04 05:23 UTCEG score recompute
  5. 2026-10-04 05:23 UTCVendor advisory
  6. 2026-10-04 05:23 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 00:54 UTCEG score recompute
  9. 2026-10-03 00:54 UTCVendor advisory
  10. 2026-10-03 00:54 UTCGHSA enrichment
  11. 2026-10-02 17:56 UTCEPSS rescore
  12. 2026-10-02 09:21 UTCEG score recompute
  13. 2026-10-02 09:21 UTCVendor advisory
  14. 2026-10-02 09:21 UTCGHSA enrichment
  15. 2026-10-01 19:50 UTCEPSS rescore
  16. 2026-10-01 10:16 UTCVendor advisory
  17. 2026-10-01 10:16 UTCGHSA enrichment
  18. 2026-09-30 22:38 UTCEG score recompute
  19. 2026-09-30 22:38 UTCVendor advisory
  20. 2026-09-30 22:38 UTCGHSA enrichment
  21. 2026-09-30 15:03 UTCEPSS rescore
  22. 2026-09-29 05:24 UTCEG score recompute
  23. 2026-09-29 05:24 UTCVendor advisory
  24. 2026-09-29 05:24 UTCGHSA enrichment
  25. 2026-09-28 02:25 UTCEG score recompute
Show 75 more
  1. 2026-09-28 02:25 UTCVendor advisory
  2. 2026-09-28 02:25 UTCGHSA enrichment
  3. 2026-09-27 13:48 UTCEPSS rescore
  4. 2026-09-27 13:09 UTCEG score recompute
  5. 2026-09-27 13:09 UTCVendor advisory
  6. 2026-09-27 13:09 UTCGHSA enrichment
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-25 04:03 UTCEG score recompute
  9. 2026-09-25 04:03 UTCVendor advisory
  10. 2026-09-25 04:03 UTCGHSA enrichment
  11. 2026-09-24 09:34 UTCVendor advisory
  12. 2026-09-24 09:34 UTCGHSA enrichment
  13. 2026-09-23 21:51 UTCEG score recompute
  14. 2026-09-23 21:51 UTCVendor advisory
  15. 2026-09-23 21:51 UTCGHSA enrichment
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 10:14 UTCVendor advisory
  18. 2026-09-23 10:14 UTCGHSA enrichment
  19. 2026-09-22 22:37 UTCEG score recompute
  20. 2026-09-22 22:37 UTCVendor advisory
  21. 2026-09-22 22:37 UTCGHSA enrichment
  22. 2026-09-22 11:01 UTCVendor advisory
  23. 2026-09-22 11:01 UTCGHSA enrichment
  24. 2026-09-21 23:02 UTCEG score recompute
  25. 2026-09-21 23:02 UTCVendor advisory
  26. 2026-09-21 23:02 UTCGHSA enrichment
  27. 2026-09-21 21:09 UTCEPSS rescore
  28. 2026-09-21 11:13 UTCVendor advisory
  29. 2026-09-21 11:13 UTCGHSA enrichment
  30. 2026-09-20 20:20 UTCEG score recompute
  31. 2026-09-20 20:20 UTCVendor advisory
  32. 2026-09-20 20:20 UTCGHSA enrichment
  33. 2026-09-20 20:16 UTCEPSS rescore
  34. 2026-09-20 02:25 UTCEG score recompute
  35. 2026-09-20 02:25 UTCVendor advisory
  36. 2026-09-20 02:24 UTCGHSA enrichment
  37. 2026-09-19 14:48 UTCVendor advisory
  38. 2026-09-19 14:47 UTCGHSA enrichment
  39. 2026-09-19 02:43 UTCEG score recompute
  40. 2026-09-19 02:43 UTCVendor advisory
  41. 2026-09-19 02:43 UTCGHSA enrichment
  42. 2026-09-18 19:28 UTCEPSS rescore
  43. 2026-09-18 14:39 UTCVendor advisory
  44. 2026-09-18 14:39 UTCGHSA enrichment
  45. 2026-09-18 02:35 UTCEG score recompute
  46. 2026-09-18 02:35 UTCVendor advisory
  47. 2026-09-18 02:35 UTCGHSA enrichment
  48. 2026-09-17 14:57 UTCVendor advisory
  49. 2026-09-17 14:57 UTCGHSA enrichment
  50. 2026-09-17 00:47 UTCEG score recompute
  51. 2026-09-17 00:47 UTCVendor advisory
  52. 2026-09-17 00:47 UTCGHSA enrichment
  53. 2026-09-16 14:08 UTCEPSS rescore
  54. 2026-09-16 05:15 UTCEPSS rescore
  55. 2026-09-16 02:35 UTCVendor advisory
  56. 2026-09-16 02:35 UTCGHSA enrichment
  57. 2026-09-15 14:45 UTCEG score recompute
  58. 2026-09-15 14:45 UTCVendor advisory
  59. 2026-09-15 14:45 UTCGHSA enrichment
  60. 2026-09-15 03:05 UTCGHSA enrichment
  61. 2026-09-14 15:28 UTCVendor advisory
  62. 2026-09-14 15:28 UTCGHSA enrichment
  63. 2026-09-14 03:51 UTCEG score recompute
  64. 2026-09-14 03:51 UTCVendor advisory
  65. 2026-09-14 03:51 UTCGHSA enrichment
  66. 2026-09-13 16:14 UTCVendor advisory
  67. 2026-09-13 16:14 UTCGHSA enrichment
  68. 2026-09-13 04:37 UTCVendor advisory
  69. 2026-09-13 04:37 UTCGHSA enrichment
  70. 2026-09-12 16:59 UTCEG score recompute
  71. 2026-09-12 16:59 UTCVendor advisory
  72. 2026-09-12 16:59 UTCGHSA enrichment
  73. 2026-09-12 05:21 UTCVendor advisory
  74. 2026-09-12 05:21 UTCGHSA enrichment
  75. 2026-09-11 17:44 UTCEG score recompute

Related CVEs(same vendor)

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 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 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68299?
CVE-2026-68299 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-68299?
A fix for CVE-2026-68299 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-68299 are linked in the Vendor Advisories panel on this page.

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