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tracing: Check return value of __register_event() in trace_module_add_events()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: tracing: Check return value of __register_event() in trace_module_add_events() trace_module_add_events() ignores the return value of __register_event() and unconditionally calls __add_event_to_tracers() for each event. If __register_event() fails (for example, if event_init() fails), the trace_event_call is not added to ftrace_events list, but __add_event_to_tracers() still creates a trace_event_file pointing to it. If module loading subsequently fails and module memory is freed, tracing state retains a stale trace_event_call pointer in trace_event_file, leading to a use-after-free when tracefs or tracing subsystem operations are later executed. Fix this by checking the return value of __register_event() and only calling __add_event_to_tracers() if event registration succeeded.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.265, 5.15.216, 6.1.183, 6.12.103, 6.18.44, 6.6.151, 7.1.8
CVEs
CVE-2026-74471
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 01:33 UTC · Revision 1

Source evidence

tracing: Check return value of __register_event() in trace_module_add_events()

core-osv · Original source

Published 15 Aug 2026, 12:27 UTC

In the Linux kernel, the following vulnerability has been resolved: tracing: Check return value of __register_event() in trace_module_add_events() trace_module_add_events() ignores the return value of __register_event() and unconditionally calls __add_event_to_tracers() for each event. If __register_event() fails (for example, if event_init() fails), the trace_event_call is not added to ftrace_events list, but __add_event_to_tracers() still creates a trace_event_file pointing to it. If module loading subsequently fails and module memory is freed, tracing state retains a stale trace_event_call pointer in trace_event_file, leading to a use-after-free when tracefs or tracing subsystem operations are later executed. Fix this by checking the return value of __register_event() and only calling __add_event_to_tracers() if event registration succeeded.

osv:CVE-2026-74471

Kernel

Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8

Complete source record
{
  "id": "603898d7cec4267c5e8595c74a5a736f4f1e9d5eefa4c7f98c9d9745d1e3f2ff",
  "url": "https://osv.dev/vulnerability/CVE-2026-74471",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tracing: Check return value of __register_event() in trace_module_add_events()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tracing: Check return value of __register_event() in trace_module_add_events() trace_module_add_events() ignores the return value of __register_event() and unconditionally calls __add_event_to_tracers() for each event. If __register_event() fails (for example, if event_init() fails), the trace_event_call is not added to ftrace_events list, but __add_event_to_tracers() still creates a trace_event_file pointing to it. If module loading subsequently fails and module memory is freed, tracing state retains a stale trace_event_call pointer in trace_event_file, leading to a use-after-free when tracefs or tracing subsystem operations are later executed. Fix this by checking the return value of __register_event() and only calling __add_event_to_tracers() if event registration succeeded.",
    "evidence": "osv:CVE-2026-74471",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "value": "6.6.151",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.8",
            "evidence": "/affected/1/ranges"
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        ],
        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74471",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      ],
      "affected": [
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        {
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              "type": "ECOSYSTEM",
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                  "introduced": "3.10.0"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
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                  "fixed": "5.15.216"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
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                  "introduced": "6.7.0"
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                  "introduced": "6.13.0"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:25.046740200Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/000765dcdc3edf128990762790543adc4b868f6c",
        "https://git.kernel.org/stable/c/22f954f7a8afe975e85517aff41b35defe05144b",
        "https://git.kernel.org/stable/c/3bf965a2827c44f03294107703e7ba53fbd0a69a",
        "https://git.kernel.org/stable/c/54b7a358f6399c1242d2fb7f4f96085af34baa5e",
        "https://git.kernel.org/stable/c/9d6d79744f01eacaf3d5522f4fcd59939581abfd",
        "https://git.kernel.org/stable/c/ac8719969e6c3c54e939834df812bc41f25453cf",
        "https://git.kernel.org/stable/c/cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca",
        "https://git.kernel.org/stable/c/d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74471.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74471",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74471.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74471",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491668,
  "published_at": "2026-08-15T12:27:08.128+00:00"
}