Critical Vulnerability in Linux Kernel: BPF Migration Issue
Summary
DEBIAN-CVE-2025-38640: In the Linux kernel, the following vulnerability has been resolved: bpf: Disable migration in nf_hook_run_bpf(). Affects linux versions < 6.12.43-1. Fixed in 6.12.43-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its stability, performance, and security features. However, vulnerabilities can arise, impacting system integrity and security. This specific vulnerability affects the netfilter BPF (Berkeley Packet Filter) program, which is utilized for packet filtering and network traffic control.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified where the netfilter BPF program can be executed without migration being disabled in the xmit path. This flaw leads to an assertion failure in the __bpf_prog_run() function, potentially causing system instability and crashes. The issue was reported by syzbot and is linked to improper handling of migration contexts, which can result in unexpected behavior during packet processing.
How To Fix
Minimum fixed version
6.12.43-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, no specific workarounds have been provided for this vulnerability. It is recommended to apply the patch as soon as it is available.
Conclusion
The identified vulnerability in the Linux kernel poses significant risks to system stability and security. Users are urged to update their systems to the latest patched versions to mitigate these risks. Regular monitoring and vulnerability management are crucial for maintaining system integrity.
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FAQ
The vulnerability allows the netfilter BPF program to be executed without proper migration controls, leading to potential assertion failures and system instability.
The vulnerability affects Linux kernel versions prior to 6.12.43-1 for Debian 13 and 6.16.3-1 for Debian 14.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Failure to address this vulnerability may lead to system crashes, instability, and potential security breaches due to improper handling of network traffic.
Currently, there are no specific workarounds available. It is advisable to apply the patch as soon as it is released.
References
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