Soft Lockup Vulnerability in Linux Kernel - RDMA/hns Package
Summary
DEBIAN-CVE-2024-43872: In the Linux kernel, the following vulnerability has been resolved: RDMA/hns: Fix soft lockup under heavy CEQE load CEQEs are handled in interrupt handler currently. Affects linux versions < 6.10.3-1. Fixed in 6.10.3-1. 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 for software applications. It supports a wide range of functionalities, including process management, memory management, and device control. The RDMA/hns (Remote Direct Memory Access) component of the kernel is designed to facilitate high-speed data transfer between computers, enhancing performance in networked environments. However, this component is susceptible to a vulnerability that can lead to system instability under heavy load conditions.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the RDMA/hns component, which can cause soft lockups when handling Completion Event Queue Entries (CEQEs) under heavy load. The issue arises because CEQEs are processed within the interrupt handler, leading to prolonged CPU core engagement in interrupt context. This can result in system unresponsiveness and degraded performance, particularly in high-demand scenarios. The vulnerability has been assigned the identifier DEBIAN-CVE-2024-43872 and affects both Debian 13 and Debian 14 versions of the Linux package.
How To Fix
Minimum fixed version
6.10.3-1
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. However, users are advised to monitor their systems for unusual behavior and consider reducing the load on the RDMA/hns component until the patch is applied.
Conclusion
The soft lockup vulnerability in the Linux kernel's RDMA/hns component poses a significant risk to system stability under heavy load conditions. Users are encouraged to update their Linux packages to the patched version 6.10.3-1 to mitigate this risk. Monitoring tools like Vulert can assist in identifying vulnerabilities in open-source software without requiring extensive setup.
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FAQ
A soft lockup occurs when a CPU core is unable to process tasks for an extended period, leading to system unresponsiveness. This can happen due to excessive load or inefficient handling of interrupts.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can check if your application is affected by this vulnerability.
If exploited, this vulnerability can lead to system instability, unresponsiveness, and degraded performance, particularly in environments with heavy network loads.
While the primary concern is system unresponsiveness, there is a potential risk of data loss if the system becomes completely unresponsive and requires a hard reboot.
Detailed information about this vulnerability can be found in the Debian CVE database, specifically at the provided JSON source link.
References
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