Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up The function ring_buffer_map_get_reader() is a bit more strict than the other get reader functions, and except for certain situations the rb_get_reader_page() should not return NULL. If it does, it triggers a warning. This warning was triggering but after looking at why, it was because another acceptable situation was happening and it wasn't checked for. If the reader catches up to the writer and there's still data to be read on the reader page, then the rb_get_reader_page() will return NULL as there's no new page to get. In this situation, the reader page should not be updated and no warning should trigger.
References
- https://git.kernel.org/stable/c/6f5c4f8109fa4d0955b3712597a26b310bdc736f
- https://git.kernel.org/stable/c/aa997d2d2a0b2e76f4df0f1f12829f02acb4fb6b
- https://git.kernel.org/stable/c/b42dbef4f208326271434d5ab71c4129a3ddd1a9
FAQ
What is CVE-2025-68186?
CVE-2025-68186 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up The function ring_buffer_map_get_reader() is a bit...
How severe is CVE-2025-68186?
CVSS scoring is not yet available for CVE-2025-68186. Check NVD for updates.
Is there a patch for CVE-2025-68186?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.