{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68329",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-68329"
  ],
  "published": "2025-12-22T16:14:44Z",
  "summary": "tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs\n\nWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel\ncalls vm_ops->close on each portion. For trace buffer mappings, this\nresults in ring_buffer_unmap() being called multiple times while\nring_buffer_map() was only called once.\n\nThis causes ring_buffer_unmap() to return -ENODEV on subsequent calls\nbecause user_mapped is already 0, triggering a WARN_ON.\n\nTrace buffer mappings cannot support partial mappings because the ring\nbuffer structure requires the complete buffer including the meta page.\n\nFix this by adding a may_split callback that returns -EINVAL to prevent\nVMA splits entirely.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68329"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}