Vulnerability in Kernel: x86/bugs - IBPB-on-entry Enabled When Not Supported
Summary
GSD-2022-1004374: x86/bugs: Do not enable IBPB-on-entry when IBPB is not supported. Affects Kernel versions >= fd17a4254965fc44044b3d7f5be186880ed7a021, < 3653093b7bbfa8c8c61858bffdc7f1e41ad436e1. 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 for the proper functioning of the system. The x86/bugs module within the Kernel is responsible for handling various processor-related vulnerabilities and mitigations. One such vulnerability is the incorrect enabling of IBPB-on-entry when IBPB (Indirect Branch Prediction Barrier) is not supported.
Vulnerability Detail
The vulnerability arises from a misconfiguration in the x86/bugs module, where IBPB-on-entry is enabled even when the underlying hardware does not support IBPB. IBPB is a security feature that prevents indirect branch predictions from being used across different security domains, enhancing protection against certain types of side-channel attacks. Enabling IBPB-on-entry without proper hardware support can lead to system instability and potential security risks. Attackers may exploit this vulnerability to bypass security measures and gain unauthorized access to sensitive information.
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 vulnerability in the Kernel's x86/bugs module, where IBPB-on-entry is enabled without proper hardware support, can lead to system instability and potential security risks. It is crucial to update the Linux Kernel to version v5.15.57 or later to mitigate this vulnerability. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can lead to system instability and potential security risks. Attackers may exploit it to bypass security measures and gain 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 to the playground, and it will provide real-time alerts for open-source vulnerabilities, including this one.
Yes, the vulnerability has been fixed in Linux Kernel version v5.15.57. It is recommended to update the Kernel to this version or a later one to mitigate the vulnerability.
There are no known exploits for this vulnerability at the moment. However, it is crucial to apply the fix promptly to prevent potential exploitation.
The vulnerability details were discovered and reported by an automated process. The actual impact and attack plausibility have not been proven yet.
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