CVE-2026-97443
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_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.
How to fix
- Linux Linuxdf097713b56ffac5eed32a9be2e7d27ac48d9087, 7f845820afaad339341c2ae42bc7fdec175df9ea, 9581123304b23049437324038698af9fb56ee663, 6.12.111, 6.14, 6.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 7ef5aa081f989ecfecc1df02068a80aebbd3ec31 ≤ v < df097713b56ffac5eed32a9be2e7d27ac48d9087, c70ca298036c58a88686ff388d3d367e9d21acf0 ≤ v < 7f845820afaad339341c2ae42bc7fdec175df9ea, c70ca298036c58a88686ff388d3d367e9d21acf0 ≤ v < 9581123304b23049437324038698af9fb56ee663, 315a50c6b1c6ce191f19f3372935d8e2ed9b53a6, 1209b0b29fd472e7dbd2b06544b019dd9f9b7e51, 6.12.24 ≤ v < 6.12.111, 6.13.12 ≤ v < 6.14, 6.14.3 ≤ v < 6.15, 6.15 | df097713b56ffac5eed32a9be2e7d27ac48d9087, 7f845820afaad339341c2ae42bc7fdec175df9ea, 9581123304b23049437324038698af9fb56ee663, 6.12.111, 6.14, 6.15 |
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