CVE-2026-98057 ring-buffer: Add checking nr_subbufs to persistent ring buffer validation
A missing validation check in the Linux kernel's persistent ring buffer allows memory corruption, potentially leading to system crashes or arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98057?
CVE-2026-98057 is a memory corruption vulnerability in Linux, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-98057?
How do I fix CVE-2026-98057?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-98057 being exploited?
There is no known exploitation of CVE-2026-98057 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98057, DEBIAN-CVE-2026-98057, GHSA-rx4w-f847-mv59, UBUNTU-CVE-2026-98057.