GHSA-437H-Q69X-6QRX

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32
VLAI
Details

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.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74471"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:51Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Check return value of __register_event() in trace_module_add_events()\n\ntrace_module_add_events() ignores the return value of __register_event()\nand unconditionally calls __add_event_to_tracers() for each event.\n\nIf __register_event() fails (for example, if event_init() fails), the\ntrace_event_call is not added to ftrace_events list, but\n__add_event_to_tracers() still creates a trace_event_file pointing to it.\nIf module loading subsequently fails and module memory is freed, tracing\nstate retains a stale trace_event_call pointer in trace_event_file,\nleading to a use-after-free when tracefs or tracing subsystem operations\nare later executed.\n\nFix this by checking the return value of __register_event() and only\ncalling __add_event_to_tracers() if event registration succeeded.",
  "id": "GHSA-437h-q69x-6qrx",
  "modified": "2026-08-19T18:32:28Z",
  "published": "2026-08-15T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74471"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/000765dcdc3edf128990762790543adc4b868f6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22f954f7a8afe975e85517aff41b35defe05144b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bf965a2827c44f03294107703e7ba53fbd0a69a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54b7a358f6399c1242d2fb7f4f96085af34baa5e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d6d79744f01eacaf3d5522f4fcd59939581abfd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac8719969e6c3c54e939834df812bc41f25453cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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