CVE-2026-43493

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-19. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: 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:

crypto: pcrypt - Fix handling of MAY_BACKLOG requests

MAY_BACKLOG requests can return EBUSY. Handle them by checking for that value and filtering out EINPROGRESS notifications.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
42.5%
KEV
Not listed

Published

May 19, 2026

Last Modified

June 26, 2026

Advisory Details (8)

Auto-updated Jul 12, 2026
No patch confirmed yet.
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eb34e243df57e32f4c08fa191f3602ea19076276
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ae7e95638d956d556d74b9abb9e780d3bd3dcd9e
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9f1cbca178c03188e201ed175251372149bb25f2
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/915b692e6cb723aac658c25eb82c58fd81235110
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/77d55bc8675ee851ed639dc9be77325a8024cf67
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/76641449b28979ebd6c02e9598367e119e385236
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a
generic

crypto: pcrypt - Fix handling of MAY_BACKLOG requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1d7f07df450bac3301938fbc4251f2611be4084e

Vendor Advisories for CVE-2026-43493(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 7× in last 7d / 81× 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 306 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43493?
CVE-2026-43493 is a critical vulnerability published on May 19, 2026. In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - Fix handling of MAY_BACKLOG requests MAY_BACKLOG requests can return EBUSY. Handle them by checking for that value and filtering out EINPROGRESS notifications.
When was CVE-2026-43493 disclosed?
CVE-2026-43493 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43493 actively exploited?
CVE-2026-43493 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 42.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43493?
CVE-2026-43493 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-43493?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43493, 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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