CVE-2025-68329 (GCVE-0-2025-68329)

Vulnerability from cvelistv5 – Published: 2025-12-22 16:12 – Updated: 2026-05-11 21:51
VLAI
Title
tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs When a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel calls vm_ops->close on each portion. For trace buffer mappings, this results in ring_buffer_unmap() being called multiple times while ring_buffer_map() was only called once. This causes ring_buffer_unmap() to return -ENODEV on subsequent calls because user_mapped is already 0, triggering a WARN_ON. Trace buffer mappings cannot support partial mappings because the ring buffer structure requires the complete buffer including the meta page. Fix this by adding a may_split callback that returns -EINVAL to prevent VMA splits entirely.
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: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < 922fdd0b755a84f9933b3ca195f60092b6bb88ee (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < 45053c12c45f0fb8ef6ab95118dd928d2fec0255 (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < b042fdf18e89a347177a49e795d8e5184778b5b6 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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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\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-\u003eclose 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:51:04.994Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255"
        },
        {
          "url": "https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"
        }
      ],
      "title": "tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68329",
    "datePublished": "2025-12-22T16:12:23.133Z",
    "dateReserved": "2025-12-16T14:48:05.296Z",
    "dateUpdated": "2026-05-11T21:51:04.994Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-01",
      "epss": "0.00184",
      "percentile": "0.07971"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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-\u003eclose 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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\ntracing: Correcci\u00f3n de WARN_ON en tracing_buffers_mmap_close para VMAs divididas\n\nCuando una VMA se divide (por ejemplo, por un munmap parcial o MAP_FIXED), el kernel llama a vm_ops -\u003e close en cada porci\u00f3n. Para los mapeos del b\u00fafer de trazas, esto resulta en que ring_buffer_unmap() se llama varias veces, mientras que ring_buffer_map() solo se llam\u00f3 una vez.\n\nEsto provoca que ring_buffer_unmap() devuelva -ENODEV en llamadas posteriores porque user_mapped ya es 0, lo que activa un WARN_ON.\n\nLos mapeos del b\u00fafer de trazas no pueden soportar mapeos parciales porque la estructura del b\u00fafer circular requiere el b\u00fafer completo, incluyendo la p\u00e1gina meta.\n\nEsto se soluciona a\u00f1adiendo una funci\u00f3n de callback may_split que devuelve -EINVAL para evitar por completo las divisiones de VMA."
          }
        ],
        "id": "CVE-2025-68329",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-12-22T17:16:00.580",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:17:53+00:00",
      "cve": "CVE-2025-68329",
      "id": "CVE-2025-68329",
      "initial_release_date": "2025-12-22T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68329.json",
      "version": "3"
    }
  }
}



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