Race Condition in Linux Kernel Affecting CPU Timer Handling

CVE-2025-38352

What is CVE-2025-38352?

CVE-2025-38352 is a vulnerability found in the Linux kernel related to the handling of CPU timers. The issue arises from a race condition occurring in the handle_posix_cpu_timers() function, which is called when a task's CPU timer needs to be processed. If a task that is actively being terminated concurrently invokes this function, it may interfere with the timer's deletion process, creating potential instability. Specifically, if the task has reached the exit notification stage and is reaped by its parent or debugger while the timer deletion function is executing, the necessary checks for the timer’s state may fail, leading to undefined behavior.

This vulnerability poses a significant risk to organizations utilizing Linux systems since the kernel is foundational to the operating system's stability and security. The potential consequences range from system crashes to the possibility of malicious exploitation, where an attacker could leverage this vulnerability to execute arbitrary code or escalate privileges.

Potential impact of CVE-2025-38352

1. System Instability: The concurrent execution of the timer handling and task termination functions could lead to unpredictable system behavior, including crashes or hangs, disrupting services and critical applications running on Linux.

2. Privilege Escalation: If exploited, this vulnerability could allow an attacker to execute malicious code within the context of a higher privileged user, increasing their control over the system and enabling further attacks.

3. Increased Attack Surface: The existence of this vulnerability may provide threat actors a new vector for exploitation, particularly if it can be leveraged in conjunction with other vulnerabilities or misconfigurations, leading to a broader compromise of organizational security.

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