CVE-2026-90013
HighCVSS 7.8Summary
A use-after-free vulnerability was found in the Linux kernel tracing mechanism. Opening an options file did not take a reference to the trace_array structure, which could lead to use of freed memory when one process opened the file while another removed the instance. The issue was fixed by adding the trace_array_options_get() function that takes a reference before use.
Risk Assessment
The vulnerability could cause a kernel crash or potentially lead to privilege escalation if an attacker can open tracing option files and concurrently remove instances.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit resolving the issue). Also restrict access to tracing interfaces (e.g., via proper permissions on /sys/kernel/tracing) for unprivileged users.
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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 options file The options files do not take the trace_array reference for the options they represent. This could cause a use-after-free kernel crash if one of these files is opened by one task and another task removes the instance that the option is for. Because it doesn't take a reference upon opening, it will not stop the removal which will free the options descriptor that is being used. As the options are somewhat dynamic in their creation at boot up, each file represents a flag in the trace_array. The trace_array has an array of indexes to represent each of these flags that is stored in the trace_flags_index array. The address of the index array element is used to pass to the inode->i_private pointer. Then that element is read which holds the index (which represents the flag) and then the index is used to calculate the trace_array descriptor from its trace_flags_index array. One issue is that the index element can not be referenced until the trace_array's reference is taken. To handle this, create a new helper function called: trace_array_options_get() that will iterate all the existing trace_arrays in the ftrace_trace_arrays list (under the trace_types_lock), and compare the passed in address of the index element with the entire array of the trace_array's trace_flags_index array. If it matches, then up the corresponding trace_array's reference and return.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS