CVE-2026-98057

In the Linux kernel, the following vulnerability has been resolved:

ring-buffer: Add checking nr subbufs to persistent ring buffer validation

Sashiko reported that the code was using meta->nr subbufs without making sure that it matched the nr pages + 1 on data that was assuming the two were the same.

Add a check to the persistent ring buffer validation code to make sure that the saved nr subbufs matches what we expect.