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

Vulnerability from cvelistv5 – Published: 2025-12-22 16:12 – Updated: 2025-12-22 16:14
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
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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          "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."
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        "dateUpdated": "2025-12-22T16:14:06.466Z",
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    "datePublished": "2025-12-22T16:12:23.133Z",
    "dateReserved": "2025-12-16T14:48:05.296Z",
    "dateUpdated": "2025-12-22T16:14:06.466Z",
    "state": "PUBLISHED"
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