vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets

{
  "id": "f4ecb1bd1fd62c583550a3de802aef5636b6ff94d065eb74dfb4fd3f0c6acf20",
  "url": "https://osv.dev/vulnerability/CVE-2026-68299",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets vmxnet3_get_hdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the outer header, but for a Geneve-encapsulated packet the device can set them based on the inner header instead, signalled by the VMXNET3_RCD_HDR_INNER_SHIFT bit in the completion descriptor. Since the function never skips the outer encapsulation, this mismatch triggers: - BUG_ON(hdr.ipv4->protocol != IPPROTO_TCP), because the outer protocol is UDP (Geneve), not TCP. - BUG_ON(hdr.eth->h_proto != ...), when the tunnel's outer and inner IP versions differ (e.g. outer IPv6/inner IPv4 or vice versa). Check VMXNET3_RCD_HDR_INNER_SHIFT up front and bail out, since the function cannot locate the inner header it would need to parse. Also convert the remaining BUG_ON()s in this function to return 0 defensively.",
    "evidence": "osv:CVE-2026-68299",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-68299",
      "aliases": [
        "CVE-2026-68299"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
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      ],
      "modified": "2026-10-28T02:30:43.622049213Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8",
        "https://git.kernel.org/stable/c/28e382646417c7e2be9c9a7079eddf627ff52b90",
        "https://git.kernel.org/stable/c/2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0",
        "https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252",
        "https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29",
        "https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38",
        "https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257",
        "https://git.kernel.org/stable/c/fbab6b73cc086e32698c86e43d1b16bf17d24c36",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68299.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68299",
        "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/2026/68xxx/CVE-2026-68299.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68299",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511569,
  "published_at": "2026-08-10T12:02:33.213+00:00"
}