CVE-2025-68329
tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs
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.
INFO
Published Date :
Dec. 22, 2025, 5:16 p.m.
Last Modified :
Dec. 22, 2025, 5:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the kernel patch to prevent VMA splits.
- Ensure trace buffer mappings are not partially unmapped.
- Update the Linux kernel to the fixed version.
References to Advisories, Solutions, and Tools
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CVE-2025-68329.
CWE - Common Weakness Enumeration
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associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
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weaknesses.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Dec. 22, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255 Added Reference https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee Added Reference https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6