Vulnerability in Kernel: x86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer
Summary
GSD-2021-1001002: x86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer. Affects Kernel versions >= 1d731e731c4cd7cbd3b1aa295f0932e7610da82f, < a7748e021b9fb7739e3cb88449296539de0b6817. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel's x86/fpu module, which handles the Floating Point Unit (FPU) state. The FPU is responsible for executing floating-point arithmetic operations and storing the results. This vulnerability specifically pertains to the handling of XRSTOR instructions from a user buffer.
Vulnerability Detail
The vulnerability arises when a failed XRSTOR instruction is performed from a user buffer. XRSTOR is an x86 instruction used to restore the FPU state. However, if the XRSTOR operation fails, the FPU state is not properly invalidated, potentially leading to security issues. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability was introduced in Linux Kernel version v5.2 and has been fixed in version v5.10.46 by commit a7748e021b9fb7739e3cb88449296539de0b6817.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
In conclusion, the vulnerability in the Kernel's x86/fpu module can potentially lead to security issues if a failed XRSTOR instruction from a user buffer is not properly handled. It is crucial to update the Linux Kernel to version v5.10.46 or later to mitigate this vulnerability. For more information and assistance, please contact DevNack.com.
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FAQ
The impact of this vulnerability is currently unknown as the attack plausibility has not been proven. However, if successfully exploited, it could potentially lead to security breaches or unauthorized access to sensitive information.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it in real-time to identify any open-source vulnerabilities, including this one.
No specific workaround has been provided for this vulnerability. It is recommended to update the Linux Kernel to the fixed version as mentioned earlier.
There are currently no known exploits for this vulnerability. However, it is crucial to apply the fix promptly to mitigate any potential risks.
You can find more information about this vulnerability in the official Linux Kernel repository. Additionally, you can reach out to info@devnack.com for further support and assistance in vulnerability remediation.
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