CVE-2026-43094
MediumCVSS 5.5Summary
W jądrze systemu Linux zidentyfikowano podatność w sterowniku ixgbevf, polegającą na braku funkcji negotiate_features w tabeli operacji Hyper-V. To prowadzi do dereferencji wskaźnika NULL w maszynach wirtualnych Hyper-V, co skutkuje błędem jądra.
Risk Assessment
Podatność ta może prowadzić do awarii maszyn wirtualnych działających na Hyper-V, co może wpłynąć na dostępność usług w organizacji. W przypadku wystąpienia błędu jądra, system może ulec zawieszeniu lub zrestartować się.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, w której ta podatność została naprawiona. Należy również monitorować systemy wirtualne na Hyper-V w celu wykrycia ewentualnych problemów.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS