Kernel Vulnerability in Linux Package: ibmvnic Resource Management Flaw
Summary
CVE-2022-48811: In the Linux kernel, the following vulnerability has been resolved: ibmvnic: don't release napi in ibmvnic_open() If ibmvnic_open() encounters an error such as when setting link state, it calls release_resources() which... 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 a core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. The ibmvnic driver is specifically designed for IBM virtual network interface cards, facilitating communication between virtual machines and physical network interfaces. This vulnerability arises from improper resource management within the ibmvnic driver, potentially leading to system crashes and instability.
Vulnerability Detail
In the Linux kernel, the vulnerability identified as CVE-2022-48811 pertains to the ibmvnic driver. The issue occurs when the function __ibmvnic_open() encounters an error, such as when setting the link state. Instead of appropriately managing resources, it calls release_resources(), which unnecessarily frees the napi structures. This can lead to a kernel NULL pointer dereference, resulting in a crash when the drmgr command is executed multiple times to add or remove a virtual network interface. The vulnerability can be exploited to cause system instability and crashes, particularly in environments relying on the ibmvnic driver for network operations.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid executing the drmgr command multiple times in quick succession until the kernel is updated. This may help mitigate the risk of encountering the crash associated with the vulnerability.
Conclusion
The CVE-2022-48811 vulnerability in the Linux kernel's ibmvnic driver poses significant risks, including system crashes and instability. Users are advised to update their kernel to mitigate these risks and should consider using tools like Vulert to monitor for vulnerabilities in their applications.
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FAQ
CVE-2022-48811 is a vulnerability in the Linux kernel's ibmvnic driver that can lead to system crashes due to improper resource management.
The vulnerability can cause kernel crashes, particularly when adding or removing virtual network interfaces, leading to potential system instability.
You should update your Linux kernel to the latest version that includes the fix for this vulnerability.
Yes, you can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Vulert is a tool that monitors and alerts for open-source vulnerabilities in software using just a manifest file like package-lock.json, providing real-time insights.
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