CVE-2026-98032 tracing: Fix subbuf resize races with trace_pipe_raw readers
A race condition in the Linux kernel tracing subsystem allows local attackers to crash the system or leak uninitialized memory via trace_pipe_raw readers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98032?
CVE-2026-98032 is a 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:
tracing: Fix subbuf resize races with trace_pipe_raw readers
Concurrent subbuffer resizes may crash trace_pipe_raw readers or leak uninitialized memory to userspace due to stale size values.
Modify ring_buffer_alloc_read_page() to handle the resizing of an existing buffer_data_read_page if necessary and add a new ring_buffer_read_page_size(). This new function enables ring-buffer buffer_data_read_page users to not call the racy ring_buffer_subbuf_size_get(). This makes the spare_size member of ftrace_buffer_info redundant.
Finally, handle buffer_data_read_page/reader_page order discrepancy in ring_buffer_read_page(). On a mismatch simply copy manually the data to the buffer_data_read_page.
Which versions are affected by CVE-2026-98032?
How do I fix CVE-2026-98032?
Apply the vendor's patch.
Is CVE-2026-98032 being exploited?
There is no known exploitation of CVE-2026-98032 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98032, DEBIAN-CVE-2026-98032, GHSA-wpxh-73rr-fxf7, UBUNTU-CVE-2026-98032.