Critical Task Management Issue in Linux Kernel: CVE-2021-47504
Summary
CVE-2021-47504: In the Linux kernel, the following vulnerability has been resolved: io_uring: ensure task_work gets run as part of cancelations If we successfully cancel a work item but that work item needs to be processed through task_... 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 resources and providing essential services to software applications. It supports a wide range of functionalities, including process management, memory management, and device control. The kernel's io_uring interface allows for efficient asynchronous I/O operations, enhancing performance for applications that require high throughput. However, the kernel is susceptible to vulnerabilities that can impact system stability and security, such as the one identified in CVE-2021-47504.
Vulnerability Detail
CVE-2021-47504 is a vulnerability in the Linux kernel's io_uring implementation, where a work item cancellation can lead to uninterruptible sleep states. If a work item is canceled but requires processing through task_work, the system may enter a state where it cannot make forward progress, resulting in an uninterruptible sleep warning. This issue can lead to system hangs and degraded performance, particularly in environments that rely heavily on asynchronous I/O operations.
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 kernel update as soon as it is available.
Conclusion
CVE-2021-47504 presents a significant risk to systems running affected versions of the Linux kernel, particularly in environments utilizing the io_uring interface. Users are strongly advised to update their kernels to the fixed versions to ensure system stability and security. Monitoring tools like Vulert can assist in identifying vulnerabilities in your software.
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FAQ
CVE-2021-47504 is a vulnerability in the Linux kernel's io_uring interface that can cause uninterruptible sleep states during work item cancellations.
This vulnerability can lead to system hangs and performance degradation, particularly in applications that rely on asynchronous I/O operations.
The vulnerability affects various versions of the Linux kernel across Debian 11, 12, and 13, with specific fixes available in version 5.15.15-1.
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 without requiring signup.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risks associated with this vulnerability.
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