PowerPC/idle: Back Chain Corruption Vulnerability in Kernel
Summary
GSD-2021-1001875: powerpc/idle: Don't corrupt back chain when going idle. Affects Kernel versions >= 6d077c37c4643394b1bae9682da48164fc147ea8, < 65ede7bd97138435c07de602efc8812c586a1d38. No fix is published. How to fix ↓
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Background
The PowerPC/idle is a component of the Linux Kernel that handles the idle state of PowerPC processors. It is responsible for managing the transition of the processor to a low-power state when it is not actively executing tasks. The vulnerability identified in this component can lead to back chain corruption when the processor goes idle. Back chain corruption can result in various issues, including system instability, crashes, and potential security vulnerabilities.
Vulnerability Detail
The PowerPC/idle vulnerability occurs when the back chain is corrupted during the transition to the idle state. The back chain is a data structure used by the PowerPC architecture to maintain a linked list of function call frames. By corrupting the back chain, an attacker may be able to manipulate the execution flow or cause memory corruption, potentially leading to arbitrary code execution or privilege escalation. This vulnerability has the potential to impact the stability and security of systems running the affected versions of the Linux Kernel.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround provided for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the patched version.
Conclusion
The PowerPC/idle vulnerability in the Linux Kernel can lead to back chain corruption, potentially resulting in system instability and security vulnerabilities. To mitigate this risk, it is crucial to update the kernel to version v5.14.15 or later. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to back chain corruption, which may result in system instability, crashes, and potential security vulnerabilities.
You can use the Vulert 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 alert you if the vulnerability is present.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate the risk.
The specific conditions required for remote exploitation are not mentioned in the vulnerability details. However, it is always recommended to apply security patches promptly to minimize the risk of remote exploitation.
The primary mitigation for this vulnerability is to update the Linux Kernel to the fixed version. It is also advisable to follow general security best practices, such as restricting access to vulnerable systems and implementing network security measures.
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