Critical Vulnerability in Linux Kernel: Uninitialized BPF Iterator Issue
Summary
DEBIAN-CVE-2025-38012: In the Linux kernel, the following vulnerability has been resolved: sched_ext: bpf_iter_scx_dsq_new() should always initialize iterator BPF programs may call next() and destroy() on BPF iterators even after new() returns... Affects linux versions < 6.12.30-1. Fixed in 6.12.30-1. 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 complex and is continuously updated to address security vulnerabilities and improve functionality. This specific vulnerability affects the BPF (Berkeley Packet Filter) iterator, which is used for network packet filtering and monitoring.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the BPF iterator management. The function bpf_iter_scx_dsq_new() fails to properly initialize the iterator when an error occurs. This oversight allows BPF programs to call next() and destroy() on an uninitialized iterator, potentially leading to dereferencing garbage data. This could result in undefined behavior, crashes, or exploitation by malicious actors.
How To Fix
Minimum fixed version
6.12.30-1
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, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the available patch as soon as possible.
Conclusion
The identified vulnerability in the Linux kernel poses significant risks due to improper initialization of BPF iterators. Users are strongly advised to update their systems to the latest patched version to ensure security and stability.
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FAQ
The vulnerability can lead to undefined behavior in BPF programs, including potential crashes or exploitation by attackers.
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Yes, a patch is available in the form of the Linux kernel version 6.12.30-1 or later.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to mitigate the risk associated with this vulnerability.
BPF programs may operate on uninitialized iterators, leading to dereferencing garbage data, which can cause crashes or unpredictable behavior.
References
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