CVE-2026-31685

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

Score 9.4 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-25. NVD baseline CVSS 9.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.4Exploit: NoneExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ip6t_eui64: reject invalid MAC header for all packets

eui64_mt6() derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address.

The existing guard only rejects an invalid MAC header when par->fragoff != 0. For packets with par->fragoff == 0, eui64_mt6() can still reach eth_hdr(skb) even when the MAC header is not valid.

Fix this by removing the par->fragoff != 0 condition so that packets with an invalid MAC header are rejected before accessing eth_hdr(skb).

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
26.1%
KEV
Not listed

Published

April 25, 2026

Last Modified

June 1, 2026

Advisory Details (5)

Auto-updated Apr 28, 2026
No patch confirmed yet.
generic

netfilter: ip6t_eui64: reject invalid MAC header for all packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8
generic

netfilter: ip6t_eui64: reject invalid MAC header for all packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091
generic

netfilter: ip6t_eui64: reject invalid MAC header for all packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6
generic

netfilter: ip6t_eui64: reject invalid MAC header for all packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55
generic

netfilter: ip6t_eui64: reject invalid MAC header for all packets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a

Vendor Advisories for CVE-2026-31685(15)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:4.18.0-372.195.1.el8_62026-06-12redhat
redhatkernel-0:3.10.0-1160.151.1.el72026-06-10redhat
redhatkernel-0:6.12.0-55.77.1.el10_02026-06-08redhat
redhatkernel-0:5.14.0-570.119.1.el9_62026-06-04redhat
redhatkernel-0:5.14.0-427.129.1.el9_42026-06-04redhat
redhatkernel-0:6.12.0-211.18.1.el10_22026-05-28redhat
redhatkernel-rt-0:4.18.0-553.126.1.rt7.467.el8_102026-05-28redhat
redhatkernel-0:4.18.0-553.126.1.el8_102026-05-28redhat
redhatkernel-0:5.14.0-687.12.1.el9_82026-05-28redhat
linuxKernel @ 5.10.258—osv

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.

Data Freshness Timeline

(refreshed 14× in last 7d / 44× 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 236 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-21 15:24 UTCEPSS rescore
  5. 2026-07-20 21:32 UTCOSV refresh
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:29 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-18 10:04 UTCEPSS rescore
  13. 2026-07-16 17:03 UTCEPSS rescore
  14. 2026-07-16 17:03 UTCEPSS rescore
  15. 2026-07-15 16:57 UTCEPSS rescore
  16. 2026-07-15 16:57 UTCEPSS rescore
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-15 02:00 UTCEPSS rescore
  19. 2026-07-13 22:30 UTCEPSS rescore
  20. 2026-07-13 06:13 UTCEPSS rescore
  21. 2026-07-13 06:13 UTCEPSS rescore
  22. 2026-07-12 05:46 UTCEPSS rescore
  23. 2026-07-11 08:27 UTCEPSS rescore
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-08 15:15 UTCEPSS rescore
Show 75 more
  1. 2026-07-07 13:46 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 02:30 UTCEPSS rescore
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-01 15:06 UTCEPSS rescore
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-28 14:07 UTCEPSS rescore
  11. 2026-06-28 14:07 UTCEPSS rescore
  12. 2026-06-28 04:56 UTCEPSS rescore
  13. 2026-06-28 04:56 UTCEPSS rescore
  14. 2026-06-27 03:08 UTCEPSS rescore
  15. 2026-06-25 13:49 UTCEPSS rescore
  16. 2026-06-25 13:49 UTCEPSS rescore
  17. 2026-06-24 14:05 UTCEPSS rescore
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-22 14:25 UTCEPSS rescore
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-21 14:56 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 01:59 UTCEPSS rescore
  25. 2026-06-19 19:25 UTCEPSS rescore
  26. 2026-06-19 19:25 UTCEPSS rescore
  27. 2026-06-18 17:52 UTCEPSS rescore
  28. 2026-06-18 17:52 UTCEPSS rescore
  29. 2026-06-17 17:53 UTCEPSS rescore
  30. 2026-06-16 17:52 UTCEPSS rescore
  31. 2026-06-15 17:49 UTCEPSS rescore
  32. 2026-06-15 05:42 UTCVendor advisory
  33. 2026-06-15 05:42 UTCGHSA enrichment
  34. 2026-06-15 01:48 UTCVendor advisory
  35. 2026-06-15 01:48 UTCGHSA enrichment
  36. 2026-06-14 23:18 UTCEPSS rescore
  37. 2026-06-14 20:33 UTCVendor advisory
  38. 2026-06-14 20:33 UTCGHSA enrichment
  39. 2026-06-14 16:37 UTCVendor advisory
  40. 2026-06-14 16:36 UTCGHSA enrichment
  41. 2026-06-14 11:30 UTCVendor advisory
  42. 2026-06-14 11:30 UTCGHSA enrichment
  43. 2026-06-13 23:00 UTCEPSS rescore
  44. 2026-06-12 23:12 UTCEPSS rescore
  45. 2026-06-12 23:12 UTCEPSS rescore
  46. 2026-06-12 12:10 UTCVendor advisory
  47. 2026-06-12 12:10 UTCGHSA enrichment
  48. 2026-06-12 05:14 UTCVendor advisory
  49. 2026-06-12 05:14 UTCGHSA enrichment
  50. 2026-06-12 01:21 UTCVendor advisory
  51. 2026-06-12 01:21 UTCGHSA enrichment
  52. 2026-06-11 21:24 UTCVendor advisory
  53. 2026-06-11 21:24 UTCGHSA enrichment
  54. 2026-06-11 17:31 UTCVendor advisory
  55. 2026-06-11 17:31 UTCGHSA enrichment
  56. 2026-06-11 14:00 UTCEPSS rescore
  57. 2026-06-11 11:54 UTCVendor advisory
  58. 2026-06-11 11:53 UTCGHSA enrichment
  59. 2026-06-10 22:18 UTCEPSS rescore
  60. 2026-06-10 19:49 UTCVendor advisory
  61. 2026-06-10 19:49 UTCGHSA enrichment
  62. 2026-06-10 15:55 UTCVendor advisory
  63. 2026-06-10 15:55 UTCGHSA enrichment
  64. 2026-06-10 13:22 UTCEPSS rescore
  65. 2026-06-10 12:02 UTCVendor advisory
  66. 2026-06-10 12:02 UTCGHSA enrichment
  67. 2026-06-10 08:08 UTCVendor advisory
  68. 2026-06-10 08:08 UTCGHSA enrichment
  69. 2026-06-10 03:40 UTCVendor advisory
  70. 2026-06-10 03:40 UTCGHSA enrichment
  71. 2026-06-09 23:47 UTCVendor advisory
  72. 2026-06-09 23:47 UTCGHSA enrichment
  73. 2026-06-09 17:30 UTCVendor advisory
  74. 2026-06-09 17:30 UTCGHSA enrichment
  75. 2026-06-09 13:36 UTCVendor advisory

Related CVEs(same product + same vendor)

Frequently asked(5)

What is CVE-2026-31685?
CVE-2026-31685 is a critical vulnerability published on April 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets eui64_mt6() derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address. The existing guard only…
When was CVE-2026-31685 disclosed?
CVE-2026-31685 was first published in the National Vulnerability Database on April 25, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31685 actively exploited?
CVE-2026-31685 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31685?
CVE-2026-31685 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-31685?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31685, 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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