Medium 5.5Published May 6, 2026

CVE-2026-43094ixgbevf: add missing negotiate_features op to Hyper-V ops table

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	871ac1cd4ce4804defcb428cbb003fd84c415ff4 builds before 376d74ea03589914fbe2dedcbebf418396c04fd0; from 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 before d8a747057a17ffc79e31df1abb11d05e1669d8e5; from bf580112ed61736c2645a893413a04732505d4b1 before 2270ebab53128fb73c4a70a292be09094074737f; from a7075f501bd33c93570af759b6f4302ef0175168 before 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484; from a7075f501bd33c93570af759b6f4302ef0175168 before 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb; from a7075f501bd33c93570af759b6f4302ef0175168 before 4821d563cd7f251ae728be1a6d04af82a294a5b9; a376e29b1b196dc90b50df7e5e3947e3026300c4; from 6.1.158 before 6.1.175; and 3 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 6.1.158 before 6.2; from 6.6.114 before 6.6.136; from 6.12.55 before 6.12.83; from 6.17.5 before 6.18; from 6.18.1 before 6.18.24; from 6.19 before 6.19.14; 6.18; 6.18; and 12 more ranges	NVD

References

References

https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0
https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5	patch
https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f	patch
https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484	patch
https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb	patch
https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.