CVE-2026-68177
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel tracing subsystem, there is an issue with delayed module refcount for the 'enable_event' trigger. The module refcount is released immediately while trigger data may still be used after the RCU grace period, leading to use-after-free. The fix moves the module ref release into the delayed callback.
Risk Assessment
The risk includes use-after-free during module removal, potentially leading to system crashes or unpredictable behavior.
Recommendation
Apply the Linux kernel patch that delays module release until all references are finished.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tracing: Delay module ref count for "enable_event" trigger Triggers are now delayed from freeing, but can still be triggered until after the RCU grace period has ended. The freeing of the enable_event data is put into the private_data_free() callback, but the put of the module refcount is done immediately. It is possible that if a module is removed that has an event that would enable (or disable) it is still active, it can read the data of the module after it is removed causing a use-after-free bug. Move the trace_event_put_ref() that releases the module into the delayed callback so that the module can not be removed until any reference to its events are finished.