CVE-2026-89502 ring-buffer: Free cpu_buffer::free_page with subbuf_order
Incorrect memory deallocation in the Linux kernel ring buffer can lead to memory corruption and potential system crashes or 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-2026-89502?
CVE-2026-89502 is a memory corruption vulnerability in Linux, published on 11 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: Free cpu_buffer::free_page with subbuf_order
When sub-buffers use an order greater than 0, cpu_buffer->free_page is allocated with subbuf_order. Use the correct order for cpu_buffer->free_page.
Which versions are affected by CVE-2026-89502?
How do I fix CVE-2026-89502?
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-2026-89502 being exploited?
There is no known exploitation of CVE-2026-89502 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89502, DEBIAN-CVE-2026-89502, GHSA-43ww-w2jp-2rjx, UBUNTU-CVE-2026-89502.