Lock pointer access vulnerability in drm_master_release() in Kernel
Summary
GSD-2021-1000856: drm: Lock pointer access in drm_master_release(). Affects Kernel versions < b235f1037c0f9253ae45ff440a33a93e964ad2ec. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities for device drivers, memory management, process scheduling, and more. The vulnerability in question affects the drm_master_release() function within the Kernel, which is responsible for releasing a DRM (Direct Rendering Manager) master. The vulnerability allows unauthorized access to a pointer, potentially leading to security breaches and system instability.
Vulnerability Detail
The vulnerability in drm_master_release() arises from a lack of proper locking mechanisms when accessing a pointer. This can be exploited by an attacker to manipulate the pointer and gain unauthorized access to sensitive data or execute arbitrary code. The impact of this vulnerability can range from information disclosure to privilege escalation, depending on the attacker's capabilities. It is crucial to address this vulnerability promptly to prevent potential security breaches and maintain system integrity.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch manually to their Kernel version if updating to the latest version is not feasible. The patch can be obtained from the commit b235f1037c0f9253ae45ff440a33a93e964ad2ec in the Linux Kernel repository. Applying the patch involves modifying the affected code to include the necessary locking mechanisms. It is recommended to consult the official documentation or seek assistance from the Kernel community for guidance on applying the patch correctly.
Conclusion
The lock pointer access vulnerability in drm_master_release() within the Kernel can lead to unauthorized access and potential security breaches. It is crucial to update the Kernel to version v4.14.237 or later, or apply the provided patch, to mitigate the vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows unauthorized access to a pointer, which can lead to information disclosure, privilege escalation, and potential system instability.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert analyzes the manifest file, such as package-lock.json, to identify and alert in real-time for open-source vulnerabilities in the software.
Updating the Linux Kernel to version v4.14.237 or later is the recommended solution. This ensures that the necessary locking mechanisms are in place to prevent unauthorized access to the pointer in drm_master_release().
Yes, users can manually apply the patch to their Kernel version if updating to the latest version is not feasible. The patch can be obtained from the commit b235f1037c0f9253ae45ff440a33a93e964ad2ec in the Linux Kernel repository.
You can refer to the vulnerability details in the Open Source Vulnerability format provided by the Cloud Security Alliance's GSD database. The details include the vulnerability ID, affected package, fix commit, and relevant references.
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