igb: Fix NULL pointer dereference in ethtool loopback test

{
  "id": "5f919455c699569f29f7016d697bba40e0ae2e49ee2a21d146b541ffa53e3c4c",
  "url": "https://osv.dev/vulnerability/CVE-2025-39875",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "igb: Fix NULL pointer dereference in ethtool loopback test",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: igb: Fix NULL pointer dereference in ethtool loopback test The igb driver currently causes a NULL pointer dereference when executing the ethtool loopback test. This occurs because there is no associated q_vector for the test ring when it is set up, as interrupts are typically not added to the test rings. Since commit 5ef44b3cb43b removed the napi_id assignment in __xdp_rxq_info_reg(), there is no longer a need to pass a napi_id to it. Therefore, simply use 0 as the last parameter.",
    "evidence": "osv:CVE-2025-39875",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.16.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-39875",
      "aliases": [
        "CVE-2025-39875"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2c6196013f84651772388a86dfd4bb033d0c0d45"
                },
                {
                  "fixed": "473be7d39efd3be383e9c0c8e44b53508b4ffeb5"
                },
                {
                  "fixed": "75871a525a596ff4d16c4aebc0018f8d0923c9b1"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39875.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.16.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39875.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.231716471Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/473be7d39efd3be383e9c0c8e44b53508b4ffeb5",
        "https://git.kernel.org/stable/c/75871a525a596ff4d16c4aebc0018f8d0923c9b1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39875.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39875",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39875.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39875",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 512391,
  "published_at": "2025-09-23T06:00:47.198+00:00"
}