tcp: fix skb_copy_ubufs() vs BIG TCP

{
  "id": "ab17240a33875be60cc8a22ac789946f8f460e322d2646ca7b2912922b2e68f3",
  "url": "https://osv.dev/vulnerability/CVE-2023-53669",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tcp: fix skb_copy_ubufs() vs BIG TCP",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy using hugepages, and skb length bigger than ~68 KB. skb_copy_ubufs() assumed it could copy all payload using up to MAX_SKB_FRAGS order-0 pages. This assumption broke when BIG TCP was able to put up to 512 KB per skb. We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45 and limit gso_max_size to 180000. A solution is to use higher order pages if needed. v2: add missing __GFP_COMP, or we leak memory.",
    "evidence": "osv:CVE-2023-53669",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.29",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.2.16",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.3.3",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
    "structured": {
      "id": "CVE-2023-53669",
      "aliases": [
        "CVE-2023-53669"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "affected": [
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          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "5.19.0"
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                  "introduced": "6.2.0"
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                  "fixed": "6.2.16"
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      ],
      "modified": "2026-10-28T02:30:31.692396407Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301",
        "https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6",
        "https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910",
        "https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53669.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53669",
        "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/2023/53xxx/CVE-2023-53669.json"
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    "related_cves": [
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        "value": "CVE-2023-53669",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 498355,
  "published_at": "2025-10-07T15:21:26.896+00:00"
}