Data Race Vulnerability in Linux Kernel's io_uring Package
Summary
CVE-2024-39508: In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: Use set_bit() and test_bit() at worker->flags Utilize set_bit() and test_bit() on worker->flags within io_uring/io-wq to address potenti... 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 and software interaction. The io_uring package is a modern interface for asynchronous I/O operations, designed to improve performance and efficiency. However, it is susceptible to concurrency issues due to improper handling of worker flags, which can lead to data races and unpredictable behavior.
Vulnerability Detail
The vulnerability, identified as CVE-2024-39508, arises from the improper use of basic bitwise operations on the io_worker->flags structure within the io_uring and io-wq components. This can lead to data races when multiple tasks attempt to read and write to the same memory location simultaneously on different CPUs. The issue is exacerbated when Kernel Concurrency Sanitizer (KCSAN) is enabled, revealing potential data races in the io_worker_handle_work and io_wq_activate_free_worker functions. The ramifications of this vulnerability include potential system instability and unpredictable behavior during I/O operations, which could affect the performance and reliability of applications relying on the io_uring interface.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the fix by updating to the latest version of the Linux kernel.
Conclusion
CVE-2024-39508 is a critical vulnerability in the Linux kernel's io_uring package that can lead to data races and system instability. It is essential for users and developers to update their systems to the latest kernel version to mitigate this risk. Utilizing tools like Vulert can help monitor and identify vulnerabilities in real-time.
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FAQ
CVE-2024-39508 is a vulnerability in the Linux kernel's io_uring package that can lead to data races due to improper handling of worker flags.
The vulnerability can cause system instability and unpredictable behavior during I/O operations, potentially affecting application performance.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Check your application against this vulnerability using the Vulert playground at Vulert Scanner.
Update your Linux kernel to version 6.9.7-1 or later, and refactor your code to use atomic operations for manipulating worker flags.
There are currently no specific workarounds available. The recommended action is to apply the fix by updating to the latest kernel version.
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