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CVE-2025-38539 – Linux kernel: Tracing Module Event Corruption

The following table lists the changes that have been made to the
CVE-2025-38539 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 16, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    tracing: Add down_write(trace_event_sem) when adding trace event

    When a module is loaded, it adds trace events defined by the module. It
    may also need to modify the modules trace printk formats to replace enum
    names with their values.

    If two modules are loaded at the same time, the adding of the event to the
    ftrace_events list can corrupt the walking of the list in the code that is
    modifying the printk format strings and crash the kernel.

    The addition of the event should take the trace_event_sem for write while
    it adds the new event.

    Also add a lockdep_assert_held() on that semaphore in
    __trace_add_event_dirs() as it iterates the list.
    Added Reference https://git.kernel.org/stable/c/33e20747b47ddc03569b6bc27a2d6894c1428182
    Added Reference https://git.kernel.org/stable/c/6bc94f20a4c304997288f9a45278c9d0c06987d3
    Added Reference https://git.kernel.org/stable/c/70fecd519caad0c1741c3379d5348c9000a5b29d
    Added Reference https://git.kernel.org/stable/c/7803b28c9aa8d8bd4e19ebcf5f0db9612b0f333b
    Added Reference https://git.kernel.org/stable/c/b5e8acc14dcb314a9b61ff19dcd9fdd0d88f70df
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