CVE-2025-68186 (GCVE-0-2025-68186)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:43 – Updated: 2026-05-11 21:48
VLAI
Title
ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 117c39200d9d760cbd5944bb89efb7b9c51965aa , < b42dbef4f208326271434d5ab71c4129a3ddd1a9 (git)
Affected: 117c39200d9d760cbd5944bb89efb7b9c51965aa , < 6f5c4f8109fa4d0955b3712597a26b310bdc736f (git)
Affected: 117c39200d9d760cbd5944bb89efb7b9c51965aa , < aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/ring_buffer.c"
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              "negate": false,
              "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": "2026-05-11T21:48:19.480Z",
        "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/6f5c4f8109fa4d0955b3712597a26b310bdc736f"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b"
        }
      ],
      "title": "ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up",
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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": "2026-05-11T21:48:19.480Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-01",
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      "percentile": "0.09487"
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                "programFiles": [
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                "vendor": "Linux",
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        "cveTags": [],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nring-buffer: No advertir en ring_buffer_map_get_reader() cuando el lector se pone al d\u00eda\n\nLa funci\u00f3n ring_buffer_map_get_reader() es un poco m\u00e1s estricta que las otras funciones de obtenci\u00f3n de lector, y excepto por ciertas situaciones, la rb_get_reader_page() no deber\u00eda devolver NULL. Si lo hace, activa una advertencia.\n\nEsta advertencia se estaba activando, pero despu\u00e9s de investigar por qu\u00e9, era porque otra situaci\u00f3n aceptable estaba ocurriendo y no se hab\u00eda comprobado.\n\nSi el lector se pone al d\u00eda con el escritor y todav\u00eda hay datos por leer en la p\u00e1gina del lector, entonces la rb_get_reader_page() devolver\u00e1 NULL ya que no hay una nueva p\u00e1gina que obtener.\n\nEn esta situaci\u00f3n, la p\u00e1gina del lector no deber\u00eda actualizarse y no deber\u00eda activarse ninguna advertencia."
          }
        ],
        "id": "CVE-2025-68186",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2025-12-16T14:15:51.240",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6f5c4f8109fa4d0955b3712597a26b310bdc736f"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:20:38+00:00",
      "cve": "CVE-2025-68186",
      "id": "CVE-2025-68186",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in ring-buffer component",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68186.json",
      "version": "3"
    }
  }
}



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