{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74471",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74471"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "tracing: Check return value of __register_event() in trace_module_add_events()",
  "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.",
  "severity": [
    {
      "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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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74471"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3bf965a2827c44f03294107703e7ba53fbd0a69a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9d6d79744f01eacaf3d5522f4fcd59939581abfd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/54b7a358f6399c1242d2fb7f4f96085af34baa5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/22f954f7a8afe975e85517aff41b35defe05144b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/000765dcdc3edf128990762790543adc4b868f6c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ac8719969e6c3c54e939834df812bc41f25453cf"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only via local init_module/finit_module module loading (MODULE_STATE_COMING notifier) and subsequent tracefs/tracing operations on poisoned event files; there is no network, adjacent-wireless, or physical-device input path into trace_module_add_events() or the stale trace_event_file dereferences.\nAC:L - An attacker can deterministically craft a module whose trace events fail event_init()/__register_event() while __add_event_to_tracers() still runs, then force module-load failure or rmmod to free module memory; no uncontrollable race, rare kernel config, or victim-specific memory layout is required.\nPR:L - Triggering the UAF requires only local tracefs/tracing access, which tracing_check_open() gates solely with LOCKDOWN_TRACEFS and DAC (no capable() check), commonly granted to tracing-group/Android/ChromeOS diagnostics users; priming stale pointers via init_module uses capable(CAP_SYS_MODULE) but is achievable on permissive dev/container hosts loading attacker modules.\nUI:N - Once tracefs is accessible, the attacker can read/write event enable/format files or invoke tracing helpers that iterate tr->events and dereference the stale trace_event_call without any separate victim user performing mounts, clicks, or configuration changes.\nS:U - The use-after-free corrupts kernel tracing heap/metadata within the same OS security authority and enables local privilege escalation; it does not cross VM, container, IOMMU, or hardware trust boundaries.\nC:H - Stale trace_event_file->event_call pointers reference freed module slab memory; subsequent trace_event_name(), call->class, and reg/unreg callbacks read attacker-influenced reclaimed heap contents, giving an arbitrary kernel memory read primitive typical of UAF bugs.\nI:H - Operations such as __ftrace_event_enable_disable() invoke call->class->reg() through the dangling trace_event_call and manipulate event flags/filters on reclaimed objects, providing controllable kernel writes and a standard UAF path to code execution.\nA:H - Dereferencing freed module-resident trace_event_call structures from tracefs or tracing subsystem operations readily causes kernel oops/panic; even without full exploitation, the UAF reliably threatens system availability and can be retriggered at will."
    }
  }
}