Description
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.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < 922fdd0b755a84f9933b3ca195f60092b6bb88ee; >= cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < 45053c12c45f0fb8ef6ab95118dd928d2fec0255; >= cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < b042fdf18e89a347177a49e795d8e5184778b5b6 |
| Linux | Linux | 6.10 |
References
Timeline
- Published
- Dec 22, 2025
- Last modified
- Oct 19, 2026
- NVD status
- Deferred