CVE-2026-97443

CVE CVE-2026-97443EUVD EUVD-2026-86056Published 2026-09-24T16:03:57.000ZLast changed 2026-09-25T12:44:20.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 6.13.12 <6.14; patch: 6.12.111; 7ef5aa081f989ecfecc1df02068a80aebbd3ec31 <df097713b56ffac5eed32a9be2e7d27ac48d9087; c70ca298036c58a88686ff388d3d367e9d21acf0 <7f845820afaad339341c2ae42bc7fdec175df9ea; 6.14.3 <6.15; 6.15; patch: 7.2; 1209b0b29fd472e7dbd2b06544b019dd9f9b7e51; c70ca298036c58a88686ff388d3d367e9d21acf0 <9581123304b23049437324038698af9fb56ee663; 315a50c6b1c6ce191f19f3372935d8e2ed9b53a6; patch: 6.18.53; patch: 0; 6.12.24 <6.12.111

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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