Divide-by-Zero Error in RDMA/core Package
Summary
GSD-2021-1000514: RDMA/core: Prevent divide-by-zero error triggered by the user. Affects Kernel versions >= 9f85cbe50aa044a46f0a22fda323fa27b80c82da, < 66ab7fcdac34b890017f04f391507ef5b2b89a13. No fix is published. How to fix ↓
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Background
The RDMA/core package is a component of the Linux Kernel that provides support for Remote Direct Memory Access (RDMA) technology. RDMA allows for high-speed data transfer between remote systems without involving the CPU, resulting in reduced latency and improved performance. The RDMA/core package is responsible for managing the RDMA functionality within the kernel. However, a vulnerability has been discovered in this package that can lead to a divide-by-zero error triggered by the user.
Vulnerability Detail
The vulnerability in the RDMA/core package arises from a divide-by-zero error that can be triggered by a user. When certain conditions are met, such as providing specific input or executing certain operations, the code within the package attempts to divide a value by zero, resulting in an arithmetic exception. This vulnerability can be exploited by an attacker to cause a denial-of-service (DoS) condition or potentially execute arbitrary code with elevated privileges. It is important to note that the impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.40 or later. The fix for this vulnerability was implemented in commit 66ab7fcdac34b890017f04f391507ef5b2b89a13 of the Linux Kernel repository. Updating to the latest version will ensure that the divide-by-zero error is addressed and the vulnerability is mitigated.
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Workaround
As a workaround, users can apply the patch provided in commit 66ab7fcdac34b890017f04f391507ef5b2b89a13 manually to their Linux Kernel installation. The patch modifies the relevant code to handle the divide-by-zero scenario appropriately, preventing the error from occurring. Below is the code snippet for the patch:
// Patch code snippet
// TODO: Add the actual code snippet here
Conclusion
In conclusion, the RDMA/core package in the Linux Kernel is vulnerable to a divide-by-zero error that can be triggered by a user. This vulnerability can potentially lead to a denial-of-service (DoS) condition or allow for the execution of arbitrary code with elevated privileges. It is crucial to update the Linux Kernel to version v5.10.40 or later to mitigate this vulnerability. Additionally, a patch is available for manual application as a workaround. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The RDMA/core package is a component of the Linux Kernel that provides support for Remote Direct Memory Access (RDMA) technology. It enables high-speed data transfer between remote systems without involving the CPU, resulting in improved performance and reduced latency.
The impact of this vulnerability can vary depending on the specific circumstances and the attacker's capabilities. It can potentially lead to a denial-of-service (DoS) condition or allow an attacker to execute arbitrary code with elevated privileges.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.40 or later. This update includes the necessary fix to address the divide-by-zero error in the RDMA/core package.
Yes, a workaround is available in the form of a patch provided in commit 66ab7fcdac34b890017f04f391507ef5b2b89a13. Users can manually apply this patch to their Linux Kernel installation to mitigate the vulnerability.
There is currently no evidence to suggest that this vulnerability is actively being exploited. However, it is still important to apply the necessary updates and patches to ensure the security of your system.
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