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.
References 4
https://git.kernel.org/stable/c/69d502457e3f76142f7fcf6e2625e80e0ce8a60f
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6c001a62c34f13fe1c6a24304c289b387d9e697d
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f0467190e6a9fc61e343c8064ef16aad513788c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/364a31052aa9ef91db137f82d797366007cd85b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67