CVE-2026-43427

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 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:

usb: class: cdc-wdm: fix reordering issue in read code path

Quoting the bug report:

Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1].

Fix it by using WRITE_ONCE and memory barriers.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
3.1%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 20, 2026

Advisory Details (8)

Auto-updated Jun 11, 2026
No patch confirmed yet.
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934
generic

usb: class: cdc-wdm: fix reordering issue in read code path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b

Vendor Advisories for CVE-2026-43427(1)

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 37× 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 129 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43427?
CVE-2026-43427 is a high vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdmread()…
When was CVE-2026-43427 disclosed?
CVE-2026-43427 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43427 actively exploited?
CVE-2026-43427 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43427?
CVE-2026-43427 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-43427?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43427, 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

Explore the affected products and dependency analysis for CVE-2026-43427

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