Vulnerability in Kernel: binder: fix async_free_space accounting for empty parcels
Summary
GSD-2022-1000032: binder: fix async_free_space accounting for empty parcels. Affects Kernel versions >= 74310e06be4d74dcf67cd108366710dee5c576d5, < 103b16a8c51f96d5fe063022869ea906c256e5da. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The binder subsystem within the Kernel enables inter-process communication (IPC) between different components of the system. It allows processes to exchange data and invoke methods across process boundaries. However, a vulnerability has been identified in the binder subsystem that affects the accounting of free space for empty parcels.
Vulnerability Detail
The vulnerability in the binder subsystem relates to the incorrect accounting of free space for empty parcels. When a parcel (a unit of data) is sent between processes, the binder subsystem allocates memory to store the parcel. However, in the case of empty parcels, the subsystem fails to account for the allocated memory, leading to potential memory leaks and resource exhaustion. An attacker could potentially exploit this vulnerability to exhaust system resources, causing denial-of-service conditions or other unexpected behavior. The vulnerability was introduced in version v4.14 of the Linux Kernel and has been fixed in version v5.4.170.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can implement a patch manually by modifying the affected code in the binder subsystem. The specific code changes required can be found in the commit 103b16a8c51f96d5fe063022869ea906c256e5da. However, it is recommended to apply the official fix by updating the Kernel to the latest version.
Conclusion
In conclusion, a vulnerability has been identified in the binder subsystem of the Linux Kernel, affecting the accounting of free space for empty parcels. This vulnerability can lead to memory leaks and resource exhaustion, potentially causing denial-of-service conditions or unexpected behavior. It is recommended to update the Kernel to version v5.4.170 or later to mitigate this vulnerability. Users can also utilize the Vulert Playground (https://vulert.com/scanner) to check if their system is affected and receive real-time vulnerability alerts. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to memory leaks and resource exhaustion, potentially causing denial-of-service conditions or unexpected behavior in the system.
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 provide real-time alerts for open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the fix promptly to mitigate any potential risks.
While a workaround is available, it is recommended to apply the official fix by updating the Kernel to the latest version. Workarounds may introduce complexities and may not provide complete protection against the vulnerability.
This report focuses on a specific vulnerability in the binder subsystem. However, the Kernel is a complex software with a large codebase, and there may be other vulnerabilities that have been identified or yet to be discovered. It is important to keep the Kernel up to date and follow security best practices.
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