Critical Vulnerability in Linux Kernel: Missing RTNL Lock in Suspend/Resume Path
Summary
DEBIAN-CVE-2025-21801: In the Linux kernel, the following vulnerability has been resolved: net: ravb: Fix missing rtnl lock in suspend/resume path Fix the suspend/resume path by ensuring the rtnl lock is held where required. Affects linux versions < 6.12.13-1. Fixed in 6.12.13-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's stability and security are paramount, as vulnerabilities can lead to system crashes, data loss, or unauthorized access. This specific vulnerability affects the suspend/resume functionality of the ravb network driver, which is crucial for managing Ethernet connections.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the ravb network driver related to the missing rtnl lock during the suspend/resume process. This oversight can lead to conflicts with ongoing network device operations, resulting in warnings and potential instability. The warning message indicates suspicious RCU usage, which may compromise the reliability of the network interface during power management events. If left unaddressed, this vulnerability could lead to unexpected behavior in network communications, impacting system performance and reliability.
How To Fix
Minimum fixed version
6.12.13-1
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. It is recommended to apply the patch as soon as it is available to mitigate any risks associated with the issue.
Conclusion
The identified vulnerability in the Linux kernel's ravb network driver poses significant risks related to network stability and system performance. It is essential for users to update to the patched version 6.12.13-1 to ensure their systems are secure. Monitoring tools like Vulert can assist in identifying vulnerabilities in open-source software, providing an additional layer of security.
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FAQ
The vulnerability is related to the missing rtnl lock in the suspend/resume path of the ravb network driver, which can lead to conflicts during network operations.
If exploited, this vulnerability could result in network instability, unexpected behavior during power management, and potential system crashes.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
Yes, the patched version of the Linux kernel is 6.12.13-1. It is recommended to update to this version to resolve the vulnerability.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to the patched version as soon as possible to mitigate risks.
References
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