Kernel Hang Vulnerability in Linux Package: nvme-fabrics Command Tag Exhaustion
Summary
DEBIAN-CVE-2024-41082: In the Linux kernel, the following vulnerability has been resolved: nvme-fabrics: use reserved tag for reg read/write command In some scenarios, if too many commands are issued by nvme command in the same time by user ta... Affects linux versions < 6.9.11-1. Fixed in 6.9.11-1. 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 supports a wide range of functionalities, including process management, memory management, and device control. The vulnerability in question affects the nvme-fabrics subsystem, which facilitates communication between NVMe devices over various transport protocols. This vulnerability can lead to a kernel hang, impacting system stability and performance.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the nvme-fabrics subsystem where excessive commands issued by user tasks can exhaust all tags of the admin queue. If a reset occurs before these commands complete, the reconnect routine may fail to update NVMe registers due to insufficient tags, resulting in a kernel hang. This issue arises from the way commands are handled concurrently, leading to potential system instability.
How To Fix
Minimum fixed version
6.9.11-1
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
As a workaround, it may be possible to modify the reg_read32(), reg_read64(), and reg_write32() functions to use reserved tags. This approach can help mitigate the issue by ensuring that sufficient tags are available during critical operations. However, this workaround should be tested thoroughly to ensure it does not introduce additional issues.
Conclusion
The vulnerability in the Linux kernel's nvme-fabrics subsystem poses a significant risk of kernel hangs due to command tag exhaustion. It is crucial for users to update their systems to the patched version to ensure stability and security. Additionally, utilizing workarounds can help mitigate the issue temporarily.
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FAQ
The vulnerability involves the exhaustion of command tags in the nvme-fabrics subsystem, which can lead to a kernel hang.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor for open-source vulnerabilities without requiring installation.
If exploited, this vulnerability can cause the kernel to hang, resulting in system instability and potential data loss.
Yes, a patch is available in version 6.9.11-1 of the Linux package. It is recommended to update to this version.
If immediate patching is not possible, consider implementing the suggested workaround to mitigate the risk until the patch can be applied.
References
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