Mitigation of cBPF Programs for Unprivileged Users in Linux Kernel
Summary
CVE-2025-37963: In the Linux kernel, the following vulnerability has been resolved: arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users Support for eBPF programs loaded by unprivileged users is typically disabled. 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, responsible for managing hardware and system resources. It provides essential services for all other parts of the operating system. The kernel is highly modular, allowing for various functionalities, including networking, file systems, and security. This vulnerability specifically affects the Berkeley Packet Filter (BPF) functionality, which is used for packet filtering and network monitoring. The issue arises from the handling of cBPF programs loaded by unprivileged users, which could lead to security risks if not properly mitigated.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified that affects the handling of cBPF programs loaded by unprivileged users. Typically, support for eBPF programs loaded by unprivileged users is disabled, meaning that only cBPF programs require mitigation. The vulnerability arises because the kernel only mitigates cBPF programs loaded by unprivileged users, while privileged users can load the same programs via eBPF, rendering the mitigation ineffective. This could potentially allow unprivileged users to exploit the system, leading to unauthorized access or manipulation of network traffic.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is advisable to monitor the system for any unauthorized access and ensure that only trusted users have the necessary privileges.
Conclusion
The vulnerability CVE-2025-37963 in the Linux kernel highlights the importance of mitigating cBPF programs loaded by unprivileged users. It is crucial to update the Linux package to the latest version to ensure system security and prevent potential exploitation. Regular monitoring and using tools like Vulert can help maintain awareness of vulnerabilities in your software.
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FAQ
cBPF stands for classic Berkeley Packet Filter, which is a mechanism for filtering network packets in the Linux kernel.
eBPF (extended Berkeley Packet Filter) programs are a more advanced version of cBPF, allowing for more complex packet filtering and monitoring capabilities.
You can use Vulert, a tool that monitors and alerts for open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can check for vulnerabilities without needing to access the code.
Yes, if the vulnerability is not addressed, there is a risk that unprivileged users could exploit the system, leading to unauthorized access or manipulation of network traffic.
More information can be found in the official CVE database or by visiting the provided source link in the vulnerability details.
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