CVE-2026-97443
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.
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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.
Detalles técnicos trazas, registros y código del informe original
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))CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-97443",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7ef5aa081f989ecfecc1df02068a80aebbd3ec31",
"lessThan": "df097713b56ffac5eed32a9be2e7d27ac48d9087",
"versionType": "git"
},
{
"status": "affected",
"version": "c70ca298036c58a88686ff388d3d367e9d21acf0",
"lessThan": "7f845820afaad339341c2ae42bc7fdec175df9ea",
"versionType": "git"
},
{
"status": "affected",
"version": "c70ca298036c58a88686ff388d3d367e9d21acf0",
"lessThan": "9581123304b23049437324038698af9fb56ee663",
"versionType": "git"
},
{
"status": "affected",
"version": "315a50c6b1c6ce191f19f3372935d8e2ed9b53a6",
"versionType": "git"
},
{
"status": "affected",
"version": "1209b0b29fd472e7dbd2b06544b019dd9f9b7e51",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.24",
"lessThan": "6.12.111",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.13.12",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.14.3",
"lessThan": "6.15",
"versionType": "semver"
}
],
"programFiles": [
"kernel/trace/trace_event_perf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/trace/trace_event_perf.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-24T17:17:22.550",
"references": [
{
"url": "https://git.kernel.org/stable/c/7f845820afaad339341c2ae42bc7fdec175df9ea",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9581123304b23049437324038698af9fb56ee663",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/df097713b56ffac5eed32a9be2e7d27ac48d9087",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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'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 -> __free_event()\n -> event->destroy() [tp_perf_event_destroy]\n -> perf_trace_destroy()\n -> perf_trace_event_close()\n -> TRACE_REG_PERF_CLOSE\n -> perf_ftrace_function_unregister()\n -> unregister_ftrace_function()\n -> __unregister_ftrace_function()\n -> WARN_ON(!(ops->flags & 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."
}
],
"lastModified": "2026-09-25T13:17:28.023",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}