Vulnerability in Kernel package: bus: qcom: Put child node before return

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Background

The Kernel package is a crucial component of the Linux operating system, responsible for managing the system's core functionality. It provides an interface between the hardware and software layers, allowing applications to interact with the underlying system resources. The bus subsystem within the Kernel package handles the communication between different devices and their drivers. One specific module, 'qcom', is designed for Qualcomm devices. This vulnerability affects the 'qcom' module within the bus subsystem.

Vulnerability Detail

The vulnerability in the 'qcom' module arises from a missing 'put' operation on a child node before returning from a function. This oversight can lead to a reference count leak, potentially causing resource exhaustion and other memory-related issues. An attacker may be able to exploit this vulnerability to trigger a denial-of-service condition or execute arbitrary code with elevated privileges. The vulnerability was introduced in version v4.9 of the Linux Kernel and has been fixed in version v5.4.119.

Workaround

If updating the Kernel package is not immediately feasible, a possible workaround is to manually apply the fix introduced in commit 3a76ec28824c01b57aa1f0927841d75e4f167cb8. This involves modifying the affected code in the 'qcom' module to ensure the 'put' operation on the child node is performed before returning from the function. Here is an example of the modified code:

// Original code
...
return ret;

// Modified code
...
put(child_node);
return ret;

Please note that applying manual modifications to the Kernel code should be done with caution and is not recommended unless absolutely necessary.

Conclusion

In conclusion, a vulnerability has been identified in the 'qcom' module of the Kernel package, which can potentially lead to a denial-of-service condition or arbitrary code execution. It is crucial to update the Linux Kernel package to version v5.4.119 or later to mitigate this vulnerability. If immediate updating is not possible, manual application of the fix or consulting with a security professional may be considered. For further support on vulnerability remediation, please contact DevNack.com.

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