CVE-2026-43094

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

State: Published
Severity: Not scored
Published: May 6, 2026
Updated: Oct 15, 2026
Reserved: May 1, 2026

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+0x50/0xa0 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	871ac1cd4ce4804defcb428cbb003fd84c415ff4 to before 376d74ea03589914fbe2dedcbebf418396c04fd0Affected 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 to before d8a747057a17ffc79e31df1abb11d05e1669d8e5Affected bf580112ed61736c2645a893413a04732505d4b1 to before 2270ebab53128fb73c4a70a292be09094074737fAffected a7075f501bd33c93570af759b6f4302ef0175168 to before 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484Affected a7075f501bd33c93570af759b6f4302ef0175168 to before 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cbAffected a7075f501bd33c93570af759b6f4302ef0175168 to before 4821d563cd7f251ae728be1a6d04af82a294a5b9Affected a376e29b1b196dc90b50df7e5e3947e3026300c4Affected 6.1.158 to before 6.1.175Affected 6.6.114 to before 6.6.136Affected 6.12.55 to before 6.12.83Affected 6.17.5 to before 6.18Affected
LinuxLinux	6.18Affected before 6.18Not affected 6.1.175 through 6.1.Not affected 6.6.136 through 6.6.Not affected 6.12.83 through 6.12.Not affected 6.18.24 through 6.18.Not affected 6.19.14 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

871ac1cd4ce4804defcb428cbb003fd84c415ff4 to before 376d74ea03589914fbe2dedcbebf418396c04fd0Affected
2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 to before d8a747057a17ffc79e31df1abb11d05e1669d8e5Affected
bf580112ed61736c2645a893413a04732505d4b1 to before 2270ebab53128fb73c4a70a292be09094074737fAffected
a7075f501bd33c93570af759b6f4302ef0175168 to before 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484Affected
a7075f501bd33c93570af759b6f4302ef0175168 to before 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cbAffected
a7075f501bd33c93570af759b6f4302ef0175168 to before 4821d563cd7f251ae728be1a6d04af82a294a5b9Affected
a376e29b1b196dc90b50df7e5e3947e3026300c4Affected
6.1.158 to before 6.1.175Affected
6.6.114 to before 6.6.136Affected
6.12.55 to before 6.12.83Affected
6.17.5 to before 6.18Affected

LinuxLinux

6.18Affected
before 6.18Not affected
6.1.175 through 6.1.*Not affected
6.6.136 through 6.6.*Not affected
6.12.83 through 6.12.*Not affected
6.18.24 through 6.18.*Not affected
6.19.14 through 6.19.*Not affected
7.0 and laterNot affected

References

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