Double Free Vulnerability in ocxl
Summary
GSD-2022-1003739: misc: ocxl: fix possible double free in ocxl_file_register_afu. Affects Kernel versions >= 75ca758adbafc81804c39b2c200ecdc819a6c042, < de65c32ace9aa70d51facc61ba986607075e3a25. No fix is published. How to fix ↓
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Background
The ocxl package is a component of the Linux Kernel that provides support for Open Coherent Accelerator Processor Interface (OpenCAPI) devices. OpenCAPI is a high-performance bus interface that allows accelerators, such as Field Programmable Gate Arrays (FPGAs), to be connected to the CPU. The ocxl_file_register_afu function in ocxl allows users to register an Accelerator Function Unit (AFU) with the kernel. This function is vulnerable to a double free issue, which can lead to memory corruption and potentially allow an attacker to execute arbitrary code.
Vulnerability Detail
The double free vulnerability in ocxl_file_register_afu occurs when the function is called multiple times with the same file descriptor. This can result in the same memory being freed twice, leading to memory corruption. An attacker who can trigger this vulnerability may be able to exploit it to execute arbitrary code with kernel privileges. The vulnerability was introduced in version v5.2 of the Linux Kernel and has been fixed in version v5.4.198.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the fixed version as soon as possible.
Conclusion
The double free vulnerability in ocxl_file_register_afu can lead to memory corruption and potential code execution with kernel privileges. Users should update their Linux Kernel to version v5.4.198 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ocxl is a component of the Linux Kernel that provides support for Open Coherent Accelerator Processor Interface (OpenCAPI) devices. It allows accelerators, such as FPGAs, to be connected to the CPU.
ocxl_file_register_afu is a function in ocxl that allows users to register an Accelerator Function Unit (AFU) with the kernel. This function is vulnerable to a double free issue.
A double free vulnerability occurs when the same memory is freed twice, leading to memory corruption. This can potentially be exploited by an attacker to execute arbitrary code.
To fix this vulnerability, update your Linux Kernel to version v5.4.198 or later. Download the latest stable version from the official repository and follow the installation instructions.
There is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the fixed version.
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