CVE-2026-43306

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-08. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: 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:

bpf: crypto: Use the correct destructor kfunc type

With CONFIG_CFI enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. I ran into the following type mismatch when running BPF self-tests:

CFI failure at bpf_obj_free_fields+0x190/0x238 (target: bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc) Internal error: Oops - CFI: 00000000f2008228 [#1] SMP ...

As bpf_crypto_ctx_release() is also used in BPF programs and using a void pointer as the argument would make the verifier unhappy, add a simple stub function with the correct type and register it as the destructor kfunc instead.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.3%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 15, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

bpf: crypto: Use the correct destructor kfunc type - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b40a5d724f29fc2eed23ff353808a9aae616b48a
generic

bpf: crypto: Use the correct destructor kfunc type - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/50d6fd69388cc7b05dce72f09080674dcede4ac9
generic

bpf: crypto: Use the correct destructor kfunc type - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4e3e57dbf46dad3498f8c4219ce2dba756875962
generic

bpf: crypto: Use the correct destructor kfunc type - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3979a550fe06b370d73647f59cf462fa525c9ec4

Vendor Advisories for CVE-2026-43306(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 / 40× 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 124 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 15:06 UTCEPSS rescore
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 05:10 UTCEG score recompute
  19. 2026-06-28 05:10 UTCVendor advisory
  20. 2026-06-28 05:10 UTCGHSA enrichment
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-26 21:36 UTCEG score recompute
  24. 2026-06-26 21:36 UTCVendor advisory
  25. 2026-06-26 21:36 UTCGHSA enrichment
Show 75 more
  1. 2026-06-25 13:49 UTCEPSS rescore
  2. 2026-06-25 13:49 UTCEPSS rescore
  3. 2026-06-24 14:05 UTCEPSS rescore
  4. 2026-06-23 21:33 UTCEPSS rescore
  5. 2026-06-22 14:25 UTCEPSS rescore
  6. 2026-06-22 14:25 UTCEPSS rescore
  7. 2026-06-21 14:56 UTCEPSS rescore
  8. 2026-06-21 14:56 UTCEPSS rescore
  9. 2026-06-21 01:59 UTCEPSS rescore
  10. 2026-06-18 17:52 UTCEPSS rescore
  11. 2026-06-18 17:52 UTCEPSS rescore
  12. 2026-06-17 17:53 UTCEPSS rescore
  13. 2026-06-17 02:01 UTCEG score recompute
  14. 2026-06-17 02:01 UTCGHSA enrichment
  15. 2026-06-16 17:52 UTCEPSS rescore
  16. 2026-06-15 17:49 UTCEPSS rescore
  17. 2026-06-15 02:20 UTCEG score recompute
  18. 2026-06-15 02:20 UTCVendor advisory
  19. 2026-06-15 02:19 UTCGHSA enrichment
  20. 2026-06-14 03:00 UTCEG score recompute
  21. 2026-06-14 03:00 UTCVendor advisory
  22. 2026-06-14 03:00 UTCGHSA enrichment
  23. 2026-06-13 23:00 UTCEPSS rescore
  24. 2026-06-12 23:18 UTCEG score recompute
  25. 2026-06-12 23:18 UTCVendor advisory
  26. 2026-06-12 23:18 UTCGHSA enrichment
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-12 23:12 UTCEPSS rescore
  29. 2026-06-12 00:02 UTCEG score recompute
  30. 2026-06-12 00:02 UTCVendor advisory
  31. 2026-06-12 00:02 UTCGHSA enrichment
  32. 2026-06-11 14:00 UTCEPSS rescore
  33. 2026-06-11 00:46 UTCEG score recompute
  34. 2026-06-11 00:46 UTCVendor advisory
  35. 2026-06-11 00:46 UTCGHSA enrichment
  36. 2026-06-10 22:18 UTCEPSS rescore
  37. 2026-06-10 13:22 UTCEPSS rescore
  38. 2026-06-10 13:22 UTCEPSS rescore
  39. 2026-06-10 01:29 UTCEG score recompute
  40. 2026-06-10 01:29 UTCVendor advisory
  41. 2026-06-10 01:29 UTCGHSA enrichment
  42. 2026-06-09 02:14 UTCEG score recompute
  43. 2026-06-09 02:14 UTCVendor advisory
  44. 2026-06-09 02:14 UTCGHSA enrichment
  45. 2026-06-08 14:17 UTCEPSS rescore
  46. 2026-06-08 14:17 UTCEPSS rescore
  47. 2026-06-08 02:57 UTCEG score recompute
  48. 2026-06-08 02:57 UTCVendor advisory
  49. 2026-06-08 02:57 UTCGHSA enrichment
  50. 2026-06-07 15:25 UTCEPSS rescore
  51. 2026-06-07 15:25 UTCEPSS rescore
  52. 2026-06-07 03:42 UTCEG score recompute
  53. 2026-06-07 03:42 UTCVendor advisory
  54. 2026-06-07 03:42 UTCGHSA enrichment
  55. 2026-06-06 13:47 UTCEPSS rescore
  56. 2026-06-06 13:47 UTCEPSS rescore
  57. 2026-06-06 04:26 UTCEG score recompute
  58. 2026-06-06 04:26 UTCVendor advisory
  59. 2026-06-06 04:26 UTCGHSA enrichment
  60. 2026-06-05 22:47 UTCEPSS rescore
  61. 2026-06-05 05:10 UTCEG score recompute
  62. 2026-06-05 05:10 UTCVendor advisory
  63. 2026-06-05 05:10 UTCGHSA enrichment
  64. 2026-06-04 13:12 UTCEPSS rescore
  65. 2026-06-04 13:12 UTCEPSS rescore
  66. 2026-06-04 05:54 UTCEG score recompute
  67. 2026-06-04 05:54 UTCVendor advisory
  68. 2026-06-04 05:54 UTCGHSA enrichment
  69. 2026-06-03 06:38 UTCEG score recompute
  70. 2026-06-03 06:38 UTCVendor advisory
  71. 2026-06-03 06:38 UTCGHSA enrichment
  72. 2026-06-02 20:13 UTCEPSS rescore
  73. 2026-06-02 07:22 UTCEG score recompute
  74. 2026-06-02 07:22 UTCVendor advisory
  75. 2026-06-02 07:22 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-43306?
CVE-2026-43306 is a medium vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: bpf: crypto: Use the correct destructor kfunc type With CONFIG_CFI enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. I ran into the following type…
When was CVE-2026-43306 disclosed?
CVE-2026-43306 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43306 actively exploited?
CVE-2026-43306 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43306?
CVE-2026-43306 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43306?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43306, 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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