net: netpoll: Initialize UDP checksum field before checksumming

{
  "id": "776454bd75f8b0d67fdb62f18e8e8ce00d9c92f1ea0ed55a4109df4071dcc11d",
  "url": "https://osv.dev/vulnerability/CVE-2025-38432",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: netpoll: Initialize UDP checksum field before checksumming",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: netpoll: Initialize UDP checksum field before checksumming commit f1fce08e63fe (\"netpoll: Eliminate redundant assignment\") removed the initialization of the UDP checksum, which was wrong and broke netpoll IPv6 transmission due to bad checksumming. udph->check needs to be set before calling csum_ipv6_magic().",
    "evidence": "osv:CVE-2025-38432",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.15.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38432",
      "aliases": [
        "CVE-2025-38432"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f1fce08e63fe1a2a8b8106b93b7244a39830edae"
                },
                {
                  "fixed": "353016ec159f939a380ff6746476a779367ba9a3"
                },
                {
                  "fixed": "f5990207026987a353d5a95204c4d9cb725637fd"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38432.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
                },
                {
                  "fixed": "6.15.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38432.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.134597626Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/353016ec159f939a380ff6746476a779367ba9a3",
        "https://git.kernel.org/stable/c/f5990207026987a353d5a95204c4d9cb725637fd",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38432.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38432",
        "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/2025/38xxx/CVE-2025-38432.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38432",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 521516,
  "published_at": "2025-07-25T14:24:13.766+00:00"
}