Vulnerability in comedi: dt9812 package - Fix DMA buffers on stack
Summary
GSD-2021-1002074: comedi: dt9812: fix DMA buffers on stack. Affects Kernel versions >= 63274cd7d38a3322d90b66a5bc976de1fb899051, < 786f5b03450454557ff858a8bead5d7c0cbf78d6. No fix is published. How to fix ↓
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Background
The comedi: dt9812 package is a component of the Linux Kernel ecosystem. It provides support for the DT9812 data acquisition device. This device is used for measuring and controlling analog and digital signals in various applications. The package includes functionality for handling DMA (Direct Memory Access) buffers, which are used for efficient data transfer between the device and the system's memory. However, a vulnerability has been discovered in the package where DMA buffers are allocated on the stack instead of the heap, potentially leading to stack-based buffer overflows.
Vulnerability Detail
The vulnerability in the comedi: dt9812 package arises from the improper allocation of DMA buffers on the stack. This can allow an attacker to overwrite adjacent memory locations, leading to potential stack-based buffer overflows. Exploiting this vulnerability could result in arbitrary code execution, denial of service, or information disclosure. The vulnerability was introduced in version v2.6.29 of the Linux Kernel and has been fixed in version v5.10.79.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.79 or later. This update includes the necessary commit (786f5b03450454557ff858a8bead5d7c0cbf78d6) that addresses the issue. Updating the Kernel will ensure that DMA buffers are correctly allocated on the heap instead of the stack, mitigating the risk of stack-based buffer overflows.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the latest version.
Conclusion
The comedi: dt9812 package in the Linux Kernel is vulnerable to a stack-based buffer overflow due to improper allocation of DMA buffers on the stack. To mitigate this vulnerability, it is crucial to update the Kernel to version v5.10.79 or later. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The comedi: dt9812 package is a component of the Linux Kernel ecosystem that provides support for the DT9812 data acquisition device.
A DMA buffer, or Direct Memory Access buffer, is a region of memory used for efficient data transfer between a device and the system's memory without involving the CPU.
A stack-based buffer overflow occurs when a program writes more data to a stack buffer than it can hold, leading to the overwriting of adjacent memory locations on the stack.
Exploiting this vulnerability could result in arbitrary code execution, denial of service, or information disclosure.
To fix this vulnerability, update the Linux Kernel to version v5.10.79 or later, which includes the necessary commit to address the issue.
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