CVE-2026-43074

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: 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:

eventpoll: defer struct eventpoll free to RCU grace period

In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
3.0%
KEV
Not listed

Published

May 6, 2026

Last Modified

June 1, 2026

Advisory Details (5)

Auto-updated May 20, 2026
No patch confirmed yet.
generic

eventpoll: defer struct eventpoll free to RCU grace period - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322
generic

eventpoll: defer struct eventpoll free to RCU grace period - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf
generic

eventpoll: defer struct eventpoll free to RCU grace period - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427
generic

eventpoll: defer struct eventpoll free to RCU grace period - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9
generic

eventpoll: defer struct eventpoll free to RCU grace period - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f

Vendor Advisories for CVE-2026-43074(7)

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 @ 6.6.136—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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 30× 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 109 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43074?
CVE-2026-43074 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU…
When was CVE-2026-43074 disclosed?
CVE-2026-43074 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43074 actively exploited?
CVE-2026-43074 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43074?
CVE-2026-43074 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43074?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43074, 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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