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CVE-2021-36148 : Security Advisory and Response

Discover the impact of CVE-2021-36148, a buffer overflow vulnerability in ACRN hypervisor before version 2.5. Learn about affected systems, exploitation risks, and mitigation strategies.

An issue was discovered in ACRN before 2.5 with the vulnerability ID CVE-2021-36148. The dmar_free_irte function in hypervisor/arch/x86/vtd.c allows an irte_alloc_bitmap buffer overflow.

Understanding CVE-2021-36148

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-36148.

What is CVE-2021-36148?

CVE-2021-36148 is a vulnerability identified in ACRN before version 2.5. It specifically involves a buffer overflow in the dmar_free_irte function within the hypervisor architecture.

The Impact of CVE-2021-36148

The vulnerability allows attackers to trigger a buffer overflow in the irte_alloc_bitmap, potentially leading to malicious activities such as unauthorized access or denial of service.

Technical Details of CVE-2021-36148

Explore the specifics of the vulnerability to understand its implications and affected systems.

Vulnerability Description

The issue arises due to inadequate input validation in the dmar_free_irte function, enabling the buffer overflow in the irte_alloc_bitmap.

Affected Systems and Versions

ACRN versions prior to 2.5 are impacted by this vulnerability, posing a risk to systems utilizing the hypervisor architecture.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by crafting specially designed inputs to trigger the buffer overflow, potentially compromising system integrity.

Mitigation and Prevention

Discover the necessary steps to address and prevent the exploitation of CVE-2021-36148.

Immediate Steps to Take

System administrators are advised to update ACRN to version 2.5 or later to mitigate the buffer overflow risk associated with the dmar_free_irte function.

Long-Term Security Practices

Implementing robust input validation mechanisms and conducting regular security assessments can enhance overall system resilience against buffer overflow vulnerabilities.

Patching and Updates

Stay informed about security patches and updates released by the ACRN project to address CVE-2021-36148 and other potential security threats.

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