CVE-2026-74471 (GCVE-0-2026-74471)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < 3bf965a2827c44f03294107703e7ba53fbd0a69a (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < 9d6d79744f01eacaf3d5522f4fcd59939581abfd (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < 54b7a358f6399c1242d2fb7f4f96085af34baa5e (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5 (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < 22f954f7a8afe975e85517aff41b35defe05144b (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < 000765dcdc3edf128990762790543adc4b868f6c (git)
Affected: ae63b31e4d0e2ec09c569306ea46f664508ef717 , < ac8719969e6c3c54e939834df812bc41f25453cf (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "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."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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-\u003eevents 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-\u003eevent_call pointers reference freed module slab memory; subsequent trace_event_name(), call-\u003eclass, 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-\u003eclass-\u003ereg() 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."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-08-19T16:37:20.725Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3bf965a2827c44f03294107703e7ba53fbd0a69a"
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        {
          "url": "https://git.kernel.org/stable/c/9d6d79744f01eacaf3d5522f4fcd59939581abfd"
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      "title": "tracing: Check return value of __register_event() in trace_module_add_events()",
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    "cveId": "CVE-2026-74471",
    "datePublished": "2026-08-15T12:27:08.128Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-08-19T16:37:20.725Z",
    "state": "PUBLISHED"
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      "title": "tracing: Check return value of __register_event() in trace_module_add_events()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74471.json",
      "version": "1"
    },
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"3bf965a2827c44f03294107703e7ba53fbd0a69a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"9d6d79744f01eacaf3d5522f4fcd59939581abfd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"54b7a358f6399c1242d2fb7f4f96085af34baa5e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"22f954f7a8afe975e85517aff41b35defe05144b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"000765dcdc3edf128990762790543adc4b868f6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae63b31e4d0e2ec09c569306ea46f664508ef717\",\"lessThan\":\"ac8719969e6c3c54e939834df812bc41f25453cf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/000765dcdc3edf128990762790543adc4b868f6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/22f954f7a8afe975e85517aff41b35defe05144b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3bf965a2827c44f03294107703e7ba53fbd0a69a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54b7a358f6399c1242d2fb7f4f96085af34baa5e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d6d79744f01eacaf3d5522f4fcd59939581abfd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac8719969e6c3c54e939834df812bc41f25453cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cbb5ed3be9cae70e1c12b1991009b4e12bf4a4ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d61ee2a27dfd5eb43ddc18af40168f5b9eb1cea5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T13:45:32+00:00",
      "cve": "CVE-2026-74471",
      "id": "CVE-2026-74471",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Check return value of __register_event() in trace_module_add_events()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74471.json",
      "version": "3"
    }
  }
}



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