CVE-2026-43094

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-06. 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:

ixgbevf: add missing negotiate_features op to Hyper-V ops table

Commit a7075f501bd3 ("ixgbevf: fix mailbox API compatibility by negotiating supported features") added the .negotiate_features callback to ixgbe_mac_operations and populated it in ixgbevf_mac_ops, but forgot to add it to ixgbevf_hv_mac_ops. This leaves the function pointer NULL on Hyper-V VMs.

During probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(), which unconditionally dereferences hw->mac.ops.negotiate_features(). On Hyper-V this results in a NULL pointer dereference:

BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine [...] Workqueue: events work_for_cpu_fn RIP: 0010:0x0 [...] Call Trace: ixgbevf_negotiate_api+0x66/0x160 [ixgbevf] ixgbevf_sw_init+0xe4/0x1f0 [ixgbevf] ixgbevf_probe+0x20f/0x4a0 [ixgbevf] local_pci_probe+0x50/0xa0 work_for_cpu_fn+0x1a/0x30 [...]

Add ixgbevf_hv_negotiate_features_vf() that returns -EOPNOTSUPP and wire it into ixgbevf_hv_mac_ops. The caller already handles -EOPNOTSUPP gracefully.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.4%
KEV
Not listed

Published

May 6, 2026

Last Modified

June 1, 2026

Advisory Details (6)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

ixgbevf: add missing negotiate_features op to Hyper-V ops table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5
generic

ixgbevf: add missing negotiate_features op to Hyper-V ops table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484
generic

ixgbevf: add missing negotiate_features op to Hyper-V ops table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9
generic

ixgbevf: add missing negotiate_features op to Hyper-V ops table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0
generic

ixgbevf: add missing negotiate_features op to Hyper-V ops table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f
generic

ixgbevf: add missing negotiate_features op to Hyper-V ops table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb

Vendor Advisories for CVE-2026-43094(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 / 31× 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.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43094?
CVE-2026-43094 is a medium vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: ixgbevf: add missing negotiate_features op to Hyper-V ops table Commit a7075f501bd3 ("ixgbevf: fix mailbox API compatibility by negotiating supported features") added the .negotiate_features callback to ixgbemacoperations and…
When was CVE-2026-43094 disclosed?
CVE-2026-43094 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-2026-43094 actively exploited?
CVE-2026-43094 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43094?
CVE-2026-43094 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43094?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43094, 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.

Dependency Blast Radius

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