CVE-2025-68186 (GCVE-0-2025-68186)
Vulnerability from cvelistv5
Published
2025-12-16 13:43
Modified
2025-12-16 13:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up The function ring_buffer_map_get_reader() is a bit more strict than the other get reader functions, and except for certain situations the rb_get_reader_page() should not return NULL. If it does, it triggers a warning. This warning was triggering but after looking at why, it was because another acceptable situation was happening and it wasn't checked for. If the reader catches up to the writer and there's still data to be read on the reader page, then the rb_get_reader_page() will return NULL as there's no new page to get. In this situation, the reader page should not be updated and no warning should trigger.
References
Impacted products
Vendor Product Version
Linux Linux Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
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          "programFiles": [
            "kernel/trace/ring_buffer.c"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up\n\nThe function ring_buffer_map_get_reader() is a bit more strict than the\nother get reader functions, and except for certain situations the\nrb_get_reader_page() should not return NULL. If it does, it triggers a\nwarning.\n\nThis warning was triggering but after looking at why, it was because\nanother acceptable situation was happening and it wasn\u0027t checked for.\n\nIf the reader catches up to the writer and there\u0027s still data to be read\non the reader page, then the rb_get_reader_page() will return NULL as\nthere\u0027s no new page to get.\n\nIn this situation, the reader page should not be updated and no warning\nshould trigger."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:43:03.814Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b42dbef4f208326271434d5ab71c4129a3ddd1a9"
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        {
          "url": "https://git.kernel.org/stable/c/aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b"
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      ],
      "title": "ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68186",
    "datePublished": "2025-12-16T13:43:03.814Z",
    "dateReserved": "2025-12-16T13:41:40.252Z",
    "dateUpdated": "2025-12-16T13:43:03.814Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
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  }
}


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