CVE-2021-4150 : What You Need to Know
Learn about CVE-2021-4150, a use-after-free flaw in the Linux kernel add_partition function allowing a local attacker to trigger a denial of service.
A detailed overview of CVE-2021-4150, a use-after-free vulnerability found in the Linux kernel's add_partition function, allowing a local attacker to cause a denial of service.
Understanding CVE-2021-4150
This section delves into the nature of the vulnerability and its potential impact.
What is CVE-2021-4150?
The CVE-2021-4150 is a use-after-free flaw discovered in the add_partition function in block/partitions/core.c in the Linux kernel. Exploitation of this vulnerability could lead to a denial of service by a local attacker with user privileges. The vulnerability arises from the absence of code cleanup when the device_add call fails during the addition of a partition to the disk.
The Impact of CVE-2021-4150
The impact of CVE-2021-4150 includes the ability for a malicious actor to exploit the vulnerability to cause a denial of service on the affected system.
Technical Details of CVE-2021-4150
In this section, we will explore the technical aspects of the vulnerability.
Vulnerability Description
The use-after-free flaw in the add_partition function in the Linux kernel allows a local attacker with user privileges to trigger a denial of service condition.
Affected Systems and Versions
The vulnerability affects systems running kernel version 5.15 rc7.
Exploitation Mechanism
The exploitation of CVE-2021-4150 involves manipulating the add_partition function to trigger the use-after-free condition, resulting in a denial of service.
Mitigation and Prevention
This section provides guidance on mitigating the risks posed by CVE-2021-4150.
Immediate Steps to Take
Users are advised to apply the necessary patches and updates provided by the Linux kernel developers to address the vulnerability.
Long-Term Security Practices
Adopting security best practices such as regular system updates and security monitoring can help prevent and detect such vulnerabilities in the future.
Patching and Updates
Regularly updating the kernel to the latest secure versions can help protect systems from known vulnerabilities.