Reset task stack state vulnerability in Linux Kernel
Summary
GSD-2021-1002547: sched/scs: Reset task stack state in bringup_cpu(). Affects Kernel versions >= f1a0a376ca0c4ef1fc3d24e3e502acbb5b795674, < 229c555260cb9c1ccdab861e16f0410f1718f302. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system. It provides essential services and functions to enable the proper functioning of the system. The vulnerability identified in the Kernel affects the sched/scs module, which is responsible for managing task scheduling and stack operations. The sched/scs module is a critical part of the Kernel that ensures efficient multitasking and resource allocation. However, a flaw in the bringup_cpu() function of the sched/scs module can lead to a reset of the task stack state, potentially causing unexpected behavior and security issues.
Vulnerability Detail
The vulnerability arises from a missing reset of the task stack state in the bringup_cpu() function of the sched/scs module. When a CPU is brought up, this function is responsible for initializing various CPU-related data structures and settings. However, due to the missing reset, the task stack state may not be properly cleared, leading to potential information leakage or corruption. Attackers may exploit this vulnerability to gain unauthorized access to sensitive data or execute arbitrary code. 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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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The identified vulnerability in the Linux Kernel's sched/scs module can potentially lead to information leakage or corruption. It is crucial to update the Kernel to the latest version to mitigate this vulnerability. For further support and assistance in vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, it has the potential to lead to information leakage or corruption, allowing unauthorized access to sensitive data or arbitrary code execution.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
There is no evidence of this vulnerability being exploited in the wild at the moment. However, it is always recommended to apply security updates and patches to mitigate potential risks.
The primary mitigation for this vulnerability is to update the Linux Kernel to the latest version available, which includes the fix for this issue. Additionally, following best practices for system security, such as restricting access and implementing proper access controls, can help reduce the risk of exploitation.
You can find more information about this vulnerability in the official Linux Kernel repository and the vulnerability database maintained by the Cloud Security Alliance. The vulnerability ID is GSD-2021-1002547.
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