CVE-2026-23364

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-03-25. NVD baseline CVSS 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.4Exploit: 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: Compare MACs in constant time

To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().

CVSS v3
7.4
EG Score
7.4(medium)
EPSS
31.4%
KEV
Not listed

Published

March 25, 2026

Last Modified

June 19, 2026

Advisory Details (7)

Auto-updated Jun 19, 2026
No patch confirmed yet.
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8a665d733940592e671ec6afadcd0be80a091a80
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c
generic

ksmbd: Compare MACs in constant time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3

Vendor Advisories for CVE-2026-23364(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.1.167—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 11× in last 7d / 50× 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 127 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-23364?
CVE-2026-23364 is a high vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().
When was CVE-2026-23364 disclosed?
CVE-2026-23364 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23364 actively exploited?
CVE-2026-23364 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23364?
CVE-2026-23364 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-23364?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23364, 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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