FKIE_CVE-2026-97443

Vulnerability from fkie_nvd - Published: 2026-09-24 17:17 - Updated: 2026-09-25 13:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f845820afaad339341c2ae42bc7fdec175df9ea
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9581123304b23049437324038698af9fb56ee663
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df097713b56ffac5eed32a9be2e7d27ac48d9087
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_event_perf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "df097713b56ffac5eed32a9be2e7d27ac48d9087",
              "status": "affected",
              "version": "7ef5aa081f989ecfecc1df02068a80aebbd3ec31",
              "versionType": "git"
            },
            {
              "lessThan": "7f845820afaad339341c2ae42bc7fdec175df9ea",
              "status": "affected",
              "version": "c70ca298036c58a88686ff388d3d367e9d21acf0",
              "versionType": "git"
            },
            {
              "lessThan": "9581123304b23049437324038698af9fb56ee663",
              "status": "affected",
              "version": "c70ca298036c58a88686ff388d3d367e9d21acf0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "315a50c6b1c6ce191f19f3372935d8e2ed9b53a6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1209b0b29fd472e7dbd2b06544b019dd9f9b7e51",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.111",
              "status": "affected",
              "version": "6.12.24",
              "versionType": "semver"
            },
            {
              "lessThan": "6.14",
              "status": "affected",
              "version": "6.13.12",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_event_perf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-97443",
  "lastModified": "2026-09-25T13:17:28.023",
  "metrics": {},
  "published": "2026-09-24T17:17:22.550",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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