Vulnerability-Lookup

GHSA-8C3V-5V6W-588P

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-19 21:32

Details

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.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43094"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:22Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-8c3v-5v6w-588p",
  "modified": "2026-05-19T21:32:01Z",
  "published": "2026-05-06T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43094"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43094 (GCVE-0-2026-43094)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17

Title

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

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/d8a747057a17ffc79…
https://git.kernel.org/stable/c/2270ebab53128fb73…
https://git.kernel.org/stable/c/4db7b61ec1d1b2b67…
https://git.kernel.org/stable/c/1455ff8809843e6e8…
https://git.kernel.org/stable/c/4821d563cd7f251ae…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 , < d8a747057a17ffc79e31df1abb11d05e1669d8e5 (git) Affected: bf580112ed61736c2645a893413a04732505d4b1 , < 2270ebab53128fb73c4a70a292be09094074737f (git) Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484 (git) Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb (git) Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 4821d563cd7f251ae728be1a6d04af82a294a5b9 (git) Affected: 871ac1cd4ce4804defcb428cbb003fd84c415ff4 (git) Affected: a376e29b1b196dc90b50df7e5e3947e3026300c4 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
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        {
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          "programFiles": [
            "drivers/net/ethernet/intel/ixgbevf/vf.c"
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            {
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          ],
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          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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        }
      ],
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        },
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          "url": "https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9"
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      ],
      "title": "ixgbevf: add missing negotiate_features op to Hyper-V ops table",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43094",
    "datePublished": "2026-05-06T07:40:25.930Z",
    "dateReserved": "2026-05-01T14:12:55.984Z",
    "dateUpdated": "2026-05-11T22:17:36.784Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-8C3V-5V6W-588P

CVE-2026-43094 (GCVE-0-2026-43094)

Tags

Sightings

Nomenclature