Memory Leak in uio_hv_generic Package
Summary
GSD-2021-1000513: uio_hv_generic: Fix a memory leak in error handling paths. Affects Kernel versions >= cdfa835c6e5e87d145f9f632b58843de97509f2b, < cdd91637d4ef33e2be19a8e16e72e7d00c996d76. No fix is published. How to fix ↓
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Background
The uio_hv_generic package is a component of the Linux Kernel, which is responsible for handling the communication between the host and the guest in a virtualized environment. It provides a generic framework for implementing user-space drivers for the Hyper-V virtualization platform. The package allows user-space applications to interact with the virtual devices provided by the Hyper-V hypervisor. However, a vulnerability has been discovered in the package that can lead to a memory leak in certain error handling paths.
Vulnerability Detail
The vulnerability in uio_hv_generic arises from a memory leak issue in the error handling paths. When certain error conditions occur during the communication between the host and the guest, the package fails to release allocated memory, resulting in a memory leak. This can potentially exhaust system resources and lead to a denial-of-service condition. The vulnerability was introduced in version v4.20 of the Linux Kernel and has been fixed in version v5.4.122 by commit cdd91637d4ef33e2be19a8e16e72e7d00c996d76.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can unload and reload the uio_hv_generic module to release the allocated memory. This can be done using the following commands:
$ sudo modprobe -r uio_hv_generic $ sudo modprobe uio_hv_generic
However, this workaround only provides a temporary solution and should not be considered a permanent fix.
Conclusion
The memory leak vulnerability in the uio_hv_generic package can be fixed by updating the Linux Kernel to version v5.4.122 or later. It is recommended to apply the fix as soon as possible to prevent potential resource exhaustion and denial-of-service attacks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
uio_hv_generic is a package in the Linux Kernel that provides a generic framework for implementing user-space drivers for the Hyper-V virtualization platform.
The vulnerability can lead to a memory leak, potentially exhausting system resources and causing a denial-of-service condition.
The vulnerability was introduced in version v4.20 of the Linux Kernel and has been fixed in version v5.4.122.
To fix the vulnerability, update the Linux Kernel to version v5.4.122 or later and recompile/reinstall the uio_hv_generic package.
Yes, a temporary workaround is to unload and reload the uio_hv_generic module using the 'modprobe' command.
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