Memory Leak in RDMA/cma in Linux Kernel
Summary
GSD-2021-1001393: RDMA/cma: Fix rdma_resolve_route() memory leak. Affects Kernel versions < 4893c938f2a140a74be91779e45e4a7fa111198f. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing system resources, including memory, processes, and device drivers. RDMA (Remote Direct Memory Access) is a technology that allows for high-speed data transfer between remote systems without involving the CPU. RDMA/cma (RDMA Connection Manager) is a component of the Linux Kernel that handles connection management for RDMA devices. It provides functions for resolving routes and establishing connections between RDMA devices. However, a memory leak vulnerability has been identified in the rdma_resolve_route() function of RDMA/cma.
Vulnerability Detail
The rdma_resolve_route() function in RDMA/cma in the Linux Kernel suffers from a memory leak vulnerability. When this function is called to resolve the route for an RDMA connection, it may allocate memory but fail to deallocate it properly in certain error scenarios. This can result in a continuous accumulation of memory over time, leading to resource exhaustion and potential denial-of-service (DoS) conditions. An attacker could potentially exploit this vulnerability by repeatedly triggering the error condition, causing the system to run out of memory and become unresponsive.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended solution is to update the Linux Kernel to the fixed version.
Conclusion
The memory leak vulnerability in RDMA/cma in the Linux Kernel can lead to resource exhaustion and potential denial-of-service (DoS) conditions. It is crucial for users to update their Linux Kernel to version v4.19.198 or later to fix this vulnerability. Regularly applying security patches and updates is essential to maintain the security and stability of the system. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The memory leak vulnerability in RDMA/cma can lead to resource exhaustion and potential denial-of-service (DoS) conditions. An attacker could exploit this vulnerability to cause the system to run out of memory and become unresponsive.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze the dependencies and alert you if any vulnerabilities, including this one, are found.
At the time of this report, there is no known public exploit for this vulnerability. However, it is always recommended to apply security patches and updates to mitigate the risk of potential exploits.
The vulnerability is present in versions of the Linux Kernel prior to v4.19.198. Therefore, systems running older versions may be affected. It is crucial to update to the fixed version to eliminate the vulnerability.
For more details about this vulnerability, you can refer to the source information provided by the Cloud Security Alliance's GSD database: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001393.json
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