{"id":"CVE-2026-97443","summary":"perf/ftrace: Fix WARNING in __unregister_ftrace_function","details":"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't 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()'s 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 & 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.","modified":"2026-10-28T02:30:54.090306789Z","published":"2026-09-24T16:03:57.790Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97443.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7f845820afaad339341c2ae42bc7fdec175df9ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9581123304b23049437324038698af9fb56ee663"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df097713b56ffac5eed32a9be2e7d27ac48d9087"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97443.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97443"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7ef5aa081f989ecfecc1df02068a80aebbd3ec31"},{"fixed":"df097713b56ffac5eed32a9be2e7d27ac48d9087"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c70ca298036c58a88686ff388d3d367e9d21acf0"},{"fixed":"7f845820afaad339341c2ae42bc7fdec175df9ea"},{"fixed":"9581123304b23049437324038698af9fb56ee663"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.24"},{"fixed":"6.12.111"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.13.12"},{"fixed":"6.14"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.14.3"},{"fixed":"6.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"315a50c6b1c6ce191f19f3372935d8e2ed9b53a6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1209b0b29fd472e7dbd2b06544b019dd9f9b7e51"}]}],"versions":["v6.12.110","v6.12.109","v6.12.108","v6.12.107","v6.12.106","v6.12.105","v6.12.104","v6.12.103","v6.12.102","v6.12.101","v6.12.100","v6.12.99","v6.12.98","v6.12.97","v6.12.96","v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.12.79","v6.12.78","v6.12.77","v6.12.76","v6.12.75","v6.12.74","v6.12.73","v6.12.72","v6.12.71","v6.12.70","v6.12.69","v6.12.68","v6.12.67","v6.12.66","v6.12.65","v6.12.64","v6.12.63","v6.12.62","v6.12.61","v6.12.60","v6.12.59","v6.12.58","v6.12.57","v6.12.56","v6.12.55","v6.12.54","v6.12.53","v6.12.52","v6.12.51","v6.12.50","v6.12.49","v6.12.48","v6.12.47","v6.12.46","v6.12.45","v6.12.44","v6.12.43","v6.12.42","v6.12.41","v6.12.40","v6.12.39","v6.12.38","v6.12.37","v6.12.36","v6.12.35","v6.12.34","v6.12.33","v6.12.32","v6.12.31","v6.12.30","v6.12.29","v6.12.28","v6.12.27","v6.12.26","v6.12.25","v6.12.24","v6.13.12","v6.14.11","v6.14.10","v6.14.9","v6.14.8","v6.14.7","v6.14.6","v6.14.5","v6.14.4","v6.14.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97443.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97443.json"}}],"schema_version":"1.9.2"}