CVE-2026-43185

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-06. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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:

ksmbd: fix signededness bug in smb_direct_prepare_negotiation()

smb_direct_prepare_negotiation() casts an unsigned __u32 value from sp->max_recv_size and req->preferred_send_size to a signed int before computing min_t(int, ...). A maliciously provided preferred_send_size of 0x80000000 will return as smaller than max_recv_size, and then be used to set the maximum allowed alowed receive size for the next message.

By sending a second message with a large value (>1420 bytes) the attacker can then achieve a heap buffer overflow.

This fix replaces min_t(int, ...) with min_t(u32)

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
45.7%
KEV
Not listed

Published

May 6, 2026

Last Modified

May 11, 2026

Advisory Details (3)

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

ksmbd: fix signededness bug in smb_direct_prepare_negotiation() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ceae058eb707ddd0d68f0872f9d9f23b7c30c37b
generic

ksmbd: fix signededness bug in smb_direct_prepare_negotiation() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6b4f875aac344cdd52a1f34cc70ed2f874a65757
generic

ksmbd: fix signededness bug in smb_direct_prepare_negotiation() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/55abc475d096da4a5356b6efb0cfdc6156bc1550

Vendor Advisories for CVE-2026-43185(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 7× in last 7d / 51× 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 225 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43185?
CVE-2026-43185 is a critical vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smbdirectprepare_negotiation() smbdirectpreparenegotiation() casts an unsigned _u32 value from sp->maxrecvsize and req->preferredsendsize to a signed int before computing min_t(int, ...). A…
When was CVE-2026-43185 disclosed?
CVE-2026-43185 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on May 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43185 actively exploited?
CVE-2026-43185 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43185?
CVE-2026-43185 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-43185?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43185, 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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