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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
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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{
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              "operator": "OR"
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      "descriptions": [
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          "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/b042fdf18e89a347177a49e795d8e5184778b5b6"
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    "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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    "redhat_vex": {
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      "cve": "CVE-2025-68329",
      "id": "CVE-2025-68329",
      "initial_release_date": "2025-12-22T00:00:00+00:00",
      "product_status:known_affected": "76",
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      "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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}



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