cxl/fwctl: Fix __fortify_panic

{
  "id": "439bf2ea92c838abaadb948d106c12566126efb9e61c5cf079738964c3e0e66f",
  "url": "https://osv.dev/vulnerability/CVE-2026-80640",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cxl/fwctl: Fix __fortify_panic",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cxl/fwctl: Fix __fortify_panic Fix a runtime assertion in cxlctl_get_supported_features(). Fortify complains that it is potentially overflowing the entries array per __counted_by_le(num_entries). Quiet the false positive by initializing @num_entries earlier. memcpy: detected buffer overflow: 48 byte write of buffer size 0 WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398 RIP: 0010:__fortify_report+0x50/0xa0 Call Trace: __fortify_panic+0xd/0xf cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]",
    "evidence": "osv:CVE-2026-80640",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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      "modified": "2026-10-28T02:30:48.319904041Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/18c67ecc5dafe14055edcea53f36f4e31df1816b",
        "https://git.kernel.org/stable/c/6c9d2e87df40d606f1c85143e9acb1ecff463d5e",
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        "https://nvd.nist.gov/vuln/detail/CVE-2026-80640",
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    "security_relevant": true,
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  "source_id": "core-osv",
  "document_id": 516686,
  "published_at": "2026-08-28T06:48:52.65+00:00"
}