Memory Barrier Vulnerability in Linux Kernel: USB Hang Issue
Summary
DEBIAN-CVE-2022-48760: In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix hang in usb_kill_urb by adding memory barriers The syzbot fuzzer has identified a bug in which processes hang waiting for usb_kill_urb()... Affects linux versions < 5.10.103-1. Fixed in 5.10.103-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to applications. It is known for its stability, performance, and flexibility, making it a popular choice for servers, desktops, and embedded systems. This vulnerability affects multiple Debian versions of the Linux package, specifically related to USB handling, where improper memory access ordering can lead to process hangs.
Vulnerability Detail
In the Linux kernel, a vulnerability was identified in the USB subsystem where processes could hang while waiting for the usb_kill_urb() function to return. This issue arises from memory-access ordering on SMP (Symmetric Multi-Processing) systems, where concurrent operations on different CPUs can lead to inconsistent views of shared variables. The lack of proper memory barriers allows one CPU to read outdated values, causing a deadlock situation. This vulnerability can lead to system instability and unresponsive behavior, particularly in environments heavily reliant on USB devices.
How To Fix
Minimum fixed version
5.10.103-1
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 patches as soon as they are released.
Conclusion
The identified vulnerability in the Linux kernel's USB subsystem poses a significant risk of process hangs due to improper memory access ordering. Users are strongly advised to update their systems to the patched versions to ensure stability and prevent potential deadlocks. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system integrity.
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FAQ
The vulnerability is related to improper memory access ordering in the USB subsystem of the Linux kernel, leading to potential hangs in processes.
Debian versions 11, 12, 13, and 14 are affected by this vulnerability.
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 result in system hangs and instability, particularly in environments that rely on USB devices.
Yes, you can run 'sudo apt-get update && sudo apt-get upgrade linux' to update to the patched version.
References
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