CVE-2026-74471

Summary

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

tracing: Check return value of __register_event() in trace_module_add_events()

trace_module_add_events() ignores the return value of __register_event() and unconditionally calls __add_event_to_tracers() for each event.

If __register_event() fails (for example, if event_init() fails), the trace_event_call is not added to ftrace_events list, but __add_event_to_tracers() still creates a trace_event_file pointing to it. If module loading subsequently fails and module memory is freed, tracing state retains a stale trace_event_call pointer in trace_event_file, leading to a use-after-free when tracefs or tracing subsystem operations are later executed.

Fix this by checking the return value of __register_event() and only calling __add_event_to_tracers() if event registration succeeded.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5
• https://git.kernel.org/stable/c/22f954f7a8afe975e85517aff41b35defe05144b
• https://git.kernel.org/stable/c/cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca
• https://git.kernel.org/stable/c/000765dcdc3edf128990762790543adc4b868f6c
• https://git.kernel.org/stable/c/ac8719969e6c3c54e939834df812bc41f25453cf

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