CVE-2026-43094 (GCVE-0-2026-43094)
Vulnerability from cvelistv5
Published
2026-05-06 07:40
Modified
2026-06-01 16:14
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 871ac1cd4ce4804defcb428cbb003fd84c415ff4
Version: 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18
Version: bf580112ed61736c2645a893413a04732505d4b1
Version: a7075f501bd33c93570af759b6f4302ef0175168
Version: a7075f501bd33c93570af759b6f4302ef0175168
Version: a7075f501bd33c93570af759b6f4302ef0175168
Version: a376e29b1b196dc90b50df7e5e3947e3026300c4
Version: 6.1.158   ≤
Version: 6.6.114   ≤
Version: 6.12.55   ≤
Version: 6.17.5   ≤
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/ixgbevf/vf.c"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nixgbevf: add missing negotiate_features op to Hyper-V ops table\n\nCommit a7075f501bd3 (\"ixgbevf: fix mailbox API compatibility by\nnegotiating supported features\") added the .negotiate_features callback\nto ixgbe_mac_operations and populated it in ixgbevf_mac_ops, but forgot\nto add it to ixgbevf_hv_mac_ops. This leaves the function pointer NULL\non Hyper-V VMs.\n\nDuring probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(),\nwhich unconditionally dereferences hw-\u003emac.ops.negotiate_features().\nOn Hyper-V this results in a NULL pointer dereference:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  [...]\n  Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine [...]\n  Workqueue: events work_for_cpu_fn\n  RIP: 0010:0x0\n  [...]\n  Call Trace:\n   ixgbevf_negotiate_api+0x66/0x160 [ixgbevf]\n   ixgbevf_sw_init+0xe4/0x1f0 [ixgbevf]\n   ixgbevf_probe+0x20f/0x4a0 [ixgbevf]\n   local_pci_probe+0x50/0xa0\n   work_for_cpu_fn+0x1a/0x30\n   [...]\n\nAdd ixgbevf_hv_negotiate_features_vf() that returns -EOPNOTSUPP and\nwire it into ixgbevf_hv_mac_ops. The caller already handles -EOPNOTSUPP\ngracefully."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:14:38.068Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484"
        },
        {
          "url": "https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9"
        }
      ],
      "title": "ixgbevf: add missing negotiate_features op to Hyper-V ops table",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43094",
    "datePublished": "2026-05-06T07:40:25.930Z",
    "dateReserved": "2026-05-01T14:12:55.984Z",
    "dateUpdated": "2026-06-01T16:14:38.068Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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