CVE-2026-97443

Status: UPDATED  |  Advisory ID: CVE-2026-97443

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

perf/ftrace: Fix WARNING in __unregister_ftrace_function

perf_ftrace_function_unregister() unconditionally calls

unregister_ftrace_function() without checking whether the ftrace_ops

was ever successfully registered. This triggers a WARN_ON in

__unregister_ftrace_function() when the ops doesn't have

FTRACE_OPS_FL_ENABLED set.

This can happen during perf_event_alloc() error cleanup when

perf_trace_destroy() is called via __free_event() on an event whose

ftrace_ops registration failed or was already torn down by

perf_try_init_event()'s err_destroy path.

The call path is:

perf_event_alloc() error cleanup

-> __free_event()

-> event->destroy() [tp_perf_event_destroy]

-> perf_trace_destroy()

-> perf_trace_event_close()

-> TRACE_REG_PERF_CLOSE

-> perf_ftrace_function_unregister()

-> unregister_ftrace_function()

-> __unregister_ftrace_function()

-> WARN_ON(!(ops->flags & FTRACE_OPS_FL_ENABLED))

Fix this by checking FTRACE_OPS_FL_ENABLED before attempting to

unregister. If the ops is not enabled, just free the filter and

return success. (NVD)

What to Do

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

References