Memory Leak in uio_hv_generic in Linux Kernel
Summary
GSD-2021-1000507: uio_hv_generic: Fix a memory leak in error handling paths. Affects Kernel versions >= cdfa835c6e5e87d145f9f632b58843de97509f2b, < d84b5e912212b05f6b5bde9f682046accfbe0354. No fix is published. How to fix ↓
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Background
The uio_hv_generic is a module in the Linux Kernel that provides a generic interface for userspace I/O drivers in the Hyper-V virtualization environment. It allows userspace drivers to communicate with the Hyper-V host through the UIO framework. The module is responsible for managing memory allocation and deallocation for these drivers. However, a vulnerability has been discovered in the error handling paths of uio_hv_generic, leading to a memory leak.
Vulnerability Detail
The vulnerability in uio_hv_generic arises from a memory leak in its error handling paths. When certain error conditions occur, the module fails to properly deallocate memory, resulting in a memory leak. This can lead to a gradual depletion of system resources, potentially causing performance degradation or even system instability. An attacker may be able to exploit this vulnerability to exhaust system memory and launch denial-of-service attacks.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the uio_hv_generic module if it is not required for their system. This can be done by blacklisting the module or removing it from the kernel configuration. However, this workaround should only be considered if the module is not essential for the system's functionality.
Conclusion
The memory leak vulnerability in uio_hv_generic can be mitigated by updating the Linux Kernel to version v5.10.40 or later. It is crucial to promptly apply this fix to prevent resource depletion and potential denial-of-service attacks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
uio_hv_generic is a module in the Linux Kernel that provides a generic interface for userspace I/O drivers in the Hyper-V virtualization environment. It allows userspace drivers to communicate with the Hyper-V host through the UIO framework.
The vulnerability can result in a memory leak, leading to a gradual depletion of system resources. This can cause performance degradation or system instability. An attacker may exploit this vulnerability to launch denial-of-service attacks.
To fix this vulnerability, update the Linux Kernel to version v5.10.40 or later. This fix is implemented in commit d84b5e912212b05f6b5bde9f682046accfbe0354.
Yes, as a workaround, you can disable the uio_hv_generic module if it is not required for your system. This can be done by blacklisting the module or removing it from the kernel configuration.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix to prevent potential exploitation.
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