CVE-2026-97443

/// Technical description

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_

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References