CVE-2026-43094
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.
How to fix
- linux linux_kernel6.2, 6.6.136, 6.12.83, 6.18, 6.18.24, 6.19.14 or later
- git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb
- git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f
- git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9
- git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484
- git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.1.158 ≤ v < 6.2, 6.6.114 ≤ v < 6.6.136, 6.12.55 ≤ v < 6.12.83, 6.17.5 ≤ v < 6.18, 6.18.1 ≤ v < 6.18.24, 6.19 ≤ v < 6.19.14, 6.18, 7.0 | 6.2, 6.6.136, 6.12.83, 6.18, 6.18.24, 6.19.14 |
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