CVE-2026-97933
UnknownSummary
A use-after-free vulnerability exists in the Linux kernel tracing subsystem. When opening a tracer options file, a race condition can cause the topts array element to be freed by removal of the trace_array instance before it is used to increment the reference counter. This can lead to use of freed memory.
Risk Assessment
A local attacker or administrator performing tracing instance operations could cause a kernel crash (panic) or potentially exploit the vulnerability for privilege escalation. The risk is especially relevant in environments where trace instance operations are performed concurrently.
Recommendation
Update the Linux kernel to a version containing the fix that introduces the trace_array_tracer_options_get() helper function to safely take a trace_array reference. If updating is not possible, restrict the ability of unprivileged users to concurrently create and delete tracing instances.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS