Description
In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Fix false warning in ring_buffer_map_get_reader()
The mmap reader can warn when it catches up with a writer that is still committing events. rb_get_reader_page() returns NULL in this case, but ring_buffer_map_get_reader() treats that result as an error.
The initial rb_per_cpu_empty() check filters out an empty buffer, but it does not guarantee that the next reader page has committed data. Writers do not take reader_lock and can advance commit_page before publishing the committed length on the new page. rb_get_reader_page() can swap to that page, catch up with the writer and return NULL.
Handle NULL through the existing no-data exit without warning. Remove the caller's reader_page == commit_page check as well, since the reader-page helper already handles that case. The existing metadata update and return path remain in place.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 32751946f9b3e502e3d6e42d98b343473112f887; >= 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 029770f5badedc0f0ff85fc45e24785cbbee4a67; >= 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438; >= 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 89bab1dba8a0167ef0d819e0f55b6bafa038e87f |
| Linux | Linux | 6.10 |
References
Timeline
- Published
- Oct 28, 2026
- Last modified
- Oct 30, 2026
- NVD status
- Received