CVE-2026-97443 (GCVE-0-2026-97443)
Vulnerability from cvelistv5
Published
2026-09-24 16:03
Modified
2026-09-25 12:44
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7ef5aa081f989ecfecc1df02068a80aebbd3ec31
Version: c70ca298036c58a88686ff388d3d367e9d21acf0
Version: c70ca298036c58a88686ff388d3d367e9d21acf0
Version: 315a50c6b1c6ce191f19f3372935d8e2ed9b53a6
Version: 1209b0b29fd472e7dbd2b06544b019dd9f9b7e51
Version: 6.12.24   ≤
Version: 6.13.12   ≤
Version: 6.14.3   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/ftrace: Fix WARNING in __unregister_ftrace_function\n\nperf_ftrace_function_unregister() unconditionally calls\nunregister_ftrace_function() without checking whether the ftrace_ops\nwas ever successfully registered. This triggers a WARN_ON in\n__unregister_ftrace_function() when the ops doesn\u0027t have\nFTRACE_OPS_FL_ENABLED set.\n\nThis can happen during perf_event_alloc() error cleanup when\nperf_trace_destroy() is called via __free_event() on an event whose\nftrace_ops registration failed or was already torn down by\nperf_try_init_event()\u0027s err_destroy path.\n\nThe call path is:\n  perf_event_alloc() error cleanup\n    -\u003e __free_event()\n      -\u003e event-\u003edestroy() [tp_perf_event_destroy]\n        -\u003e perf_trace_destroy()\n          -\u003e perf_trace_event_close()\n            -\u003e TRACE_REG_PERF_CLOSE\n              -\u003e perf_ftrace_function_unregister()\n                -\u003e unregister_ftrace_function()\n                  -\u003e __unregister_ftrace_function()\n                    -\u003e WARN_ON(!(ops-\u003eflags \u0026 FTRACE_OPS_FL_ENABLED))\n\nFix this by checking FTRACE_OPS_FL_ENABLED before attempting to\nunregister. If the ops is not enabled, just free the filter and\nreturn success."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T12:44:20.881Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/df097713b56ffac5eed32a9be2e7d27ac48d9087"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f845820afaad339341c2ae42bc7fdec175df9ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/9581123304b23049437324038698af9fb56ee663"
        }
      ],
      "title": "perf/ftrace: Fix WARNING in __unregister_ftrace_function",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97443",
    "datePublished": "2026-09-24T16:03:57.790Z",
    "dateReserved": "2026-09-24T14:53:16.870Z",
    "dateUpdated": "2026-09-25T12:44:20.881Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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