---
id: CVE-2026-43094
title: |-
  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 …
summary: |-
  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 …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.1.158, < 6.2'
  - 'linux_kernel >= 6.6.114, < 6.6.136'
  - 'linux_kernel >= 6.12.55, < 6.12.83'
  - 'linux_kernel >= 6.17.5, < 6.18'
  - 'linux_kernel >= 6.18.1, < 6.18.24'
  - 'linux_kernel >= 6.19, < 6.19.14'
  - linux_kernel = 6.18
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.14
published: '2026-05-06'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:19:30.717'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43094'
references:
  - url: 'https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00162
epssPercentile: 0.0506
ingestedAt: '2026-10-15T03:30:12.872Z'
---

## Overview

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.

## Affected

- `linux_kernel >= 6.1.158, < 6.2`
- `linux_kernel >= 6.6.114, < 6.6.136`
- `linux_kernel >= 6.12.55, < 6.12.83`
- `linux_kernel >= 6.17.5, < 6.18`
- `linux_kernel >= 6.18.1, < 6.18.24`
- `linux_kernel >= 6.19, < 6.19.14`
- `linux_kernel = 6.18`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.14`