x86/fpu: Prevent state corruption in __fpu__restore_sig() - Kernel
Summary
GSD-2021-1001001: x86/fpu: Prevent state corruption in fpurestore_sig(). Affects Kernel versions >= b860eb8dce5906b14e3a7f3c771e0b3d6ef61b94, < 076f732b16a5bf842686e1b43ab6021a2d98233e. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential services, such as process management, memory management, and device drivers. The x86/fpu subsystem within the Kernel handles floating-point operations and manages the Floating Point Unit (FPU) state. The FPU state includes registers and control information related to floating-point calculations. The vulnerability in question affects the __fpu__restore_sig() function within the x86/fpu subsystem.
Vulnerability Detail
The vulnerability in __fpu__restore_sig() can lead to state corruption within the FPU. An attacker could potentially exploit this vulnerability to manipulate the FPU state, leading to unexpected behavior or privilege escalation. The vulnerability was introduced in version v5.8 of the Linux Kernel and was fixed in version v5.10.46. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The vulnerability in __fpu__restore_sig() within the x86/fpu subsystem of the Linux Kernel can potentially lead to state corruption in the FPU. It is crucial to update the Kernel to version v5.10.46 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is a critical component of the Linux operating system that provides essential services and acts as an interface between the hardware and software layers.
The x86/fpu subsystem within the Linux Kernel handles floating-point operations and manages the Floating Point Unit (FPU) state, which includes registers and control information related to floating-point calculations.
__fpu__restore_sig() is a function within the x86/fpu subsystem that is responsible for restoring the FPU state during signal handling.
The impact of this vulnerability is not yet proven, but it could potentially lead to state corruption within the FPU, resulting in unexpected behavior or privilege escalation.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.46 or later, as it includes the necessary patch to prevent state corruption in __fpu__restore_sig().
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