CVE-2021-4148 : Security Advisory and Response
Discover the impact of CVE-2021-4148, a vulnerability in the Linux kernel's block_invalidatepage function, allowing local attackers to initiate a denial of service attack.
A vulnerability was discovered in the Linux kernel that affects the block_invalidatepage function in fs/buffer.c, potentially leading to a denial of service (DOS) attack by a local user with user privileges.
Understanding CVE-2021-4148
This CVE identifies a flaw in the Linux kernel's handling of block_invalidatepage that could be exploited by an attacker to disrupt system operations.
What is CVE-2021-4148?
The vulnerability in the Linux kernel's block_invalidatepage function in the fs/buffer.c file could be abused by a local attacker to trigger a denial of service situation by bypassing a required sanity check.
The Impact of CVE-2021-4148
If successfully exploited, this vulnerability could allow a local user with limited privileges to cause a denial of service, leading to system instability and potential service disruption.
Technical Details of CVE-2021-4148
This section provides specific technical aspects of CVE-2021-4148.
Vulnerability Description
The vulnerability in the Linux kernel allows an attacker with user privileges to exploit a missing sanity check in the block_invalidatepage function, resulting in a potential denial of service threat.
Affected Systems and Versions
The vulnerability impacts systems running kernel version 5.14.16. Users on this version are advised to take immediate action to mitigate the risk.
Exploitation Mechanism
By leveraging the flaw in the block_invalidatepage function of the Linux kernel, a local attacker could disrupt system service by exploiting the missing sanity check.
Mitigation and Prevention
Understanding how to address and prevent CVE-2021-4148 is crucial for ensuring system security.
Immediate Steps to Take
To mitigate the risk associated with CVE-2021-4148, users are recommended to apply relevant security patches provided by the Linux kernel maintainers.
Long-Term Security Practices
In addition to immediate patching, it is essential to follow best security practices, such as regular system updates, network segmentation, and user privilege management, to enhance overall system security.
Patching and Updates
Stay informed about security updates and patches released by the Linux kernel maintainers to address vulnerabilities like CVE-2021-4148 and ensure that systems are up-to-date with the latest security measures.