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

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-06-01 16:14
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 871ac1cd4ce4804defcb428cbb003fd84c415ff4 , < 376d74ea03589914fbe2dedcbebf418396c04fd0 (git)
Affected: 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 , < d8a747057a17ffc79e31df1abb11d05e1669d8e5 (git)
Affected: bf580112ed61736c2645a893413a04732505d4b1 , < 2270ebab53128fb73c4a70a292be09094074737f (git)
Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484 (git)
Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb (git)
Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 4821d563cd7f251ae728be1a6d04af82a294a5b9 (git)
Affected: a376e29b1b196dc90b50df7e5e3947e3026300c4 (git)
Affected: 6.1.158 , < 6.1.175 (semver)
Affected: 6.6.114 , < 6.6.136 (semver)
Affected: 6.12.55 , < 6.12.83 (semver)
Affected: 6.17.5 , < 6.18 (semver)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (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)
guessed Create a notification for this product.
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            "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."
          }
        ],
        "id": "CVE-2026-43094",
        "lastModified": "2026-06-17T10:48:55.530",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-05-06T10:16:22.790",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:35:16+00:00",
      "cve": "CVE-2026-43094",
      "id": "CVE-2026-43094",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ixgbevf: add missing negotiate_features op to Hyper-V ops table",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43094.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:21:07Z",
      "cve": "CVE-2026-43094",
      "id": "CVE-2026-43094",
      "initial_release_date": "2026-05-07T02:18:42Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "321",
      "product_status:recommended": "228",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43094",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43094.json",
      "version": "8"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.