CVE-2021-3347 : Vulnerability Insights and Analysis
Discover the details of CVE-2021-3347, a Linux kernel vulnerability allowing local users to execute code, its impact, affected systems, and prevention steps.
An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
Understanding CVE-2021-3347
This section provides an overview of the CVE-2021-3347 vulnerability.
What is CVE-2021-3347?
CVE-2021-3347 is a vulnerability in the Linux kernel that allows local users to execute code in the kernel by exploiting a use-after-free issue in PI futexes during fault handling.
The Impact of CVE-2021-3347
The impact of this vulnerability is significant as it allows local users to gain escalated privileges and execute arbitrary code in the kernel, potentially leading to a complete system compromise.
Technical Details of CVE-2021-3347
Here are the technical details related to CVE-2021-3347.
Vulnerability Description
The vulnerability in the Linux kernel through version 5.10.11 stems from a use-after-free issue in PI futexes during fault handling, enabling local users to execute code within the kernel.
Affected Systems and Versions
All Linux kernel versions up to 5.10.11 are affected by this vulnerability.
Exploitation Mechanism
The exploitation of CVE-2021-3347 involves leveraging the use-after-free condition in PI futexes during fault handling to execute malicious code in the kernel.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-3347, take the following steps:
Immediate Steps to Take
- Apply the latest security updates provided by the Linux kernel maintainers.
- Monitor for any unusual system behavior that might indicate an exploitation attempt.
Long-Term Security Practices
- Regularly update and patch the Linux kernel to address known vulnerabilities.
- Implement the principle of least privilege to restrict user access and minimize the impact of potential breaches.
Patching and Updates
Ensure timely installation of security patches released by the Linux kernel developers to protect your system from known vulnerabilities.