KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect() in Kernel
Summary
GSD-2021-1001653: KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect(). Affects Kernel versions >= 7ee30bc132c683d06a6d9e360e39e483e3990708, < bebabb76ad9acca8858e0371e102fb60d708e25b. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionality and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures security and stability. The vulnerability in question affects the Kernel's x86 architecture and specifically the ioapic_write_indirect() function. This function is responsible for handling indirect writes to the I/O APIC (Advanced Programmable Interrupt Controller) in the Kernel's virtualization module known as KVM (Kernel-based Virtual Machine).
Vulnerability Detail
The vulnerability arises from a stack-out-of-bounds memory access issue in the ioapic_write_indirect() function. This vulnerability could potentially be exploited by an attacker to gain unauthorized access or execute arbitrary code on the affected system. The issue was introduced in version v5.5 of the Linux Kernel and was fixed in version v5.10.71. The vulnerability has the potential to impact systems running the affected versions of the Kernel.
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. However, users can consider implementing general security best practices such as restricting access to vulnerable systems, applying necessary security patches, and regularly updating their software to minimize the risk of exploitation.
Conclusion
The vulnerability in the Kernel's x86 architecture, specifically in the ioapic_write_indirect() function, poses a potential security risk. It is crucial to update the Linux Kernel to version v5.10.71 or later to address this vulnerability. Users should follow the recommended steps provided in this report to ensure the security and stability of their systems. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability could potentially allow an attacker to gain unauthorized access or execute arbitrary code on the affected system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) and the Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to promptly apply the recommended fix to mitigate any potential risks.
The exact attack vector for this vulnerability is not specified in the available information. However, it is advisable to assume that remote exploitation may be possible and take appropriate precautions.
The recommended solution is to update the Linux Kernel to the fixed version. However, if updating is not immediately feasible, users can consider implementing additional security measures such as network segmentation, access controls, and intrusion detection systems to mitigate the risk of exploitation.
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