Critical Race Condition in Linux Kernel Kprobe Initialization
Summary
DEBIAN-CVE-2025-40042: In the Linux kernel, the following vulnerability has been resolved: tracing: Fix race condition in kprobe initialization causing NULL pointer dereference There is a critical race condition in kprobe initialization that c... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware management and system resource allocation. It is widely used in various distributions, including Debian. The kernel's kprobe functionality allows developers to dynamically insert probes into running kernel code, enabling debugging and performance monitoring. However, a critical vulnerability has been identified in the kprobe initialization process, which can lead to system instability and crashes.
Vulnerability Detail
In the Linux kernel, a race condition in the kprobe initialization can lead to a NULL pointer dereference, resulting in a kernel crash. This vulnerability arises when the kprobe activation and perf_events initialization occur simultaneously across different CPU cores. If a probe is triggered before the perf_events structure is fully initialized, it can cause the system to crash, leading to potential data loss and service disruption. The vulnerability is identified as CVE-2025-40042.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds available for this vulnerability. The best course of action is to apply the necessary updates as soon as they are available.
Conclusion
The CVE-2025-40042 vulnerability in the Linux kernel poses a significant risk due to a race condition in kprobe initialization. Users are strongly advised to update their systems to the patched version of the kernel to prevent potential crashes and data loss. Monitoring tools like Vulert can assist in identifying vulnerabilities in your software.
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FAQ
CVE-2025-40042 is a critical vulnerability in the Linux kernel related to a race condition in kprobe initialization, which can lead to a NULL pointer dereference and kernel crash.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
The vulnerability can lead to system crashes, data loss, and service disruption, affecting the stability and reliability of systems running the vulnerable kernel.
Yes, a patch has been released for the Linux kernel to address CVE-2025-40042. Users should update their kernel to the latest version to apply the fix.
While there are no specific workarounds, it is crucial to prioritize updating your kernel as soon as possible to mitigate the risks associated with this vulnerability.
References
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