{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23380",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23380"
  ],
  "published": "2026-03-25T10:28:03Z",
  "summary": "tracing: Fix WARN_ON in tracing_buffers_mmap_close",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close\n\nWhen a process forks, the child process copies the parent's VMAs but the\nuser_mapped reference count is not incremented. As a result, when both the\nparent and child processes exit, tracing_buffers_mmap_close() is called\ntwice. On the second call, user_mapped is already 0, causing the function to\nreturn -ENODEV and triggering a WARN_ON.\n\nNormally, this isn't an issue as the memory is mapped with VM_DONTCOPY set.\nBut this is only a hint, and the application can call\nmadvise(MADVISE_DOFORK) which resets the VM_DONTCOPY flag. When the\napplication does that, it can trigger this issue on fork.\n\nFix it by incrementing the user_mapped reference count without re-mapping\nthe pages in the VMA's open callback.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23380"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/91f3e8d84c89918769e71393f839c9fefadc2580"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cdd96641b64297a2db42676f051362b76280a58b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b0f269ba6fefe9e3cb9feedcf78fcd0b633800c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e39bb9e02b68942f8e9359d2a3efe7d37ae6be0e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}