Memory: Renesas-rpc-if: Possible NULL Pointer Dereference in Linux Kernel
Summary
GSD-2021-1000380: memory: renesas-rpc-if: fix possible NULL pointer dereference of resource. Affects Kernel versions >= ca7d8b980b67f133317525c4273e144116ee1ae5, < 71bcc1b4a1743534d8abdcb57ff912e6bc390438. No fix is published. How to fix ↓
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Background
The Renesas-rpc-if is a memory module in the Linux Kernel that provides an interface for communication with Renesas RPC (Remote Procedure Call) devices. It is responsible for managing resources and facilitating data transfer between the kernel and RPC devices. This vulnerability in the Renesas-rpc-if module can lead to a NULL pointer dereference, potentially causing a system crash or allowing an attacker to execute arbitrary code.
Vulnerability Detail
The vulnerability arises from a possible NULL pointer dereference of a resource in the Renesas-rpc-if module. When certain conditions are met, a NULL pointer can be accessed, leading to a crash or potential code execution. The impact and attack plausibility of this vulnerability have not been proven yet. It was introduced in Linux Kernel version v5.9 by commit ca7d8b980b67f133317525c4273e144116ee1ae5 and fixed in version v5.10.37 by commit 71bcc1b4a1743534d8abdcb57ff912e6bc390438.
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 v5.10.37 or later. This can be done by pulling the latest updates from the official Linux Kernel repository and rebuilding the kernel. Ensure that the Renesas-rpc-if module is included in the build. After updating the kernel, the vulnerability should be resolved.
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Workaround
As a workaround, if updating the kernel is not immediately feasible, you can disable or remove the Renesas-rpc-if module from the kernel configuration. This can be done by modifying the kernel configuration file and rebuilding the kernel without including the Renesas-rpc-if module. However, this workaround may result in the loss of functionality provided by the module.
Conclusion
The Renesas-rpc-if module in the Linux Kernel is vulnerable to a NULL pointer dereference, which can lead to system crashes or potential code execution. It is recommended to update the kernel to version v5.10.37 or later to fix this vulnerability. Alternatively, the Renesas-rpc-if module can be disabled or removed from the kernel configuration as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Renesas-rpc-if module is a memory module in the Linux Kernel that facilitates communication with Renesas RPC devices. It manages resources and enables data transfer between the kernel and RPC devices.
A NULL pointer dereference occurs when a program attempts to access or manipulate memory using a pointer that is not pointing to a valid memory location (i.e., it has a value of NULL). This can lead to crashes, unexpected behavior, or potential security vulnerabilities.
The potential consequences of this vulnerability include system crashes, denial-of-service conditions, or the execution of arbitrary code by an attacker. However, the actual impact and attack plausibility have not been proven yet.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in software.
Yes, if updating the kernel is not immediately feasible, you can disable or remove the Renesas-rpc-if module from the kernel configuration. However, this may result in the loss of functionality provided by the module.
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