CVE-2026-43094

/// Technical description

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+0x50/0xa

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References