CVE-2026-97933

Status: UPDATED  |  Advisory ID: CVE-2026-97933

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

tracing: Take trace_array reference when opening a tracer options file

When a tracer option file is opened, it is passed a descriptor that points

to an element on the trace_array's topts array. This element has

information to find the trace array and other information. It uses this

element to take a reference of the trace_array so that the trace_array

does not get removed while this file is opened.

Unfortunately, there's a race condition where the element itself could be

freed by the removal of the instance the trace_array represents causing a

use-after-free as this element that is used to find the trace_array to

increment its reference counter is also freed when the instance is

removed.

To solve this, add a trace_array_tracer_options_get() helper function that

will take the address of the element that is passed to the open function

by the inode->i_private pointer and search all the trace_arrays under a

lock to find the one that the element's address is in the range of the

trace_arrays topts array elements. When a match happens, that trace_array's

reference would be increased.

Note, there's a race where if an admin was deleting and creating trace

instances at the same time and the memory of the old trace_array's array

matched the memory of the new trace_array that it could in theory open the

option from the wrong trace array. But we do not care because it would be

stupid to perform that kind of action. As long as the only thing that can

happen is that the option from the wrong trace array is used and doesn't

crash the kernel it will only make the user confused. But if they are

doing something stupid like this, they are already confused, so no harm

done. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References