CVE-2021-3490 : What You Need to Know
Discover the details of CVE-2021-3490, a critical vulnerability in Linux kernel's eBPF ALU32 bounds tracking for bitwise operations, allowing for arbitrary code execution. Learn about impacts, affected systems, and mitigation steps.
This article provides details about CVE-2021-3490, a vulnerability in the Linux kernel's eBPF bitwise ops ALU32 bounds tracking.
Understanding CVE-2021-3490
This section dives into the specifics of the vulnerability and its impact.
What is CVE-2021-3490?
The eBPF ALU32 bounds tracking for bitwise ops (AND, OR, and XOR) in the Linux kernel did not properly update 32-bit bounds, leading to potential out-of-bounds reads and writes and enabling arbitrary code execution. The issue has been addressed in various Linux kernel versions.
The Impact of CVE-2021-3490
The vulnerability posed a high risk, with a CVSS base score of 7.8 for integrity, confidentiality, and availability impact. Attack vector was local, and privileges required were low, emphasizing the severity of unauthorized access.
Technical Details of CVE-2021-3490
This section outlines the technical aspects of the vulnerability.
Vulnerability Description
The issue was a result of inadequate 32-bit bounds updates during bitwise operations, facilitating out-of-bounds access and arbitrary code execution.
Affected Systems and Versions
Linux kernels up to version v5.13-rc4, v5.12.4, v5.11.21, v5.10.37, and v5.7-rc1 were impacted by this vulnerability, affecting a wide range of systems.
Exploitation Mechanism
The vulnerability could be exploited by manipulating bitwise operations and 32-bit bounds tracking, enabling malicious actors to execute arbitrary code.
Mitigation and Prevention
This section provides insights on how to address and prevent the CVE-2021-3490 vulnerability.
Immediate Steps to Take
Users are advised to apply the necessary security patches provided by Linux kernel maintainers promptly to mitigate the risk of exploitation.
Long-Term Security Practices
Regularly updating systems and monitoring security advisories can help prevent and detect vulnerabilities before they can be exploited.
Patching and Updates
Stay informed about the latest patches and updates released by Linux kernel developers to address CVE-2021-3490 and other potential security risks.