CVE-2026-31738

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-01. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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:

vxlan: validate ND option lengths in vxlan_na_create

vxlan_na_create() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

May 1, 2026

Last Modified

May 7, 2026

Advisory Details (8)

Auto-updated Aug 2, 2026
No patch confirmed yet.
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7
generic

vxlan: validate ND option lengths in vxlan_na_create - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (125 versions)6.19.12-1—

All Vendor Advisories

(24)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 32× 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 210 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31738?
CVE-2026-31738 is a medium vulnerability published on May 1, 2026. In the Linux kernel, the following vulnerability has been resolved: vxlan: validate ND option lengths in vxlannacreate vxlannacreate() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source…
When was CVE-2026-31738 disclosed?
CVE-2026-31738 was first published in the National Vulnerability Database on May 1, 2026, with the most recent update on May 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31738 actively exploited?
CVE-2026-31738 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.7% of all scored CVEs.
What is the CVSS score of CVE-2026-31738?
CVE-2026-31738 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-31738?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31738, 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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