CVE-2019-19378 : Security Advisory and Response

A slab-out-of-bounds write access vulnerability in index_rbio_pages in fs/btrfs/raid56.c can be exploited by mounting a specially crafted btrfs filesystem image in Linux kernel version 5.0.21.

Understanding CVE-2019-19378

This CVE involves a specific vulnerability in the Linux kernel version 5.0.21 that allows for a slab-out-of-bounds write access when a manipulated btrfs filesystem image is mounted.

What is CVE-2019-19378?

This CVE identifies a flaw in the Linux kernel that can be triggered by mounting a carefully designed btrfs filesystem image, leading to unauthorized write access.

The Impact of CVE-2019-19378

The vulnerability can be exploited to perform unauthorized write actions, potentially leading to system compromise or data manipulation.

Technical Details of CVE-2019-19378

This section delves into the technical aspects of the CVE.

Vulnerability Description

The flaw allows for a slab-out-of-bounds write access in index_rbio_pages in fs/btrfs/raid56.c when a specific btrfs filesystem image is mounted.

Affected Systems and Versions

Linux kernel version 5.0.21

Exploitation Mechanism

The vulnerability is triggered by mounting a carefully crafted btrfs filesystem image.

Mitigation and Prevention

Protecting systems from CVE-2019-19378 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply relevant patches and updates provided by the Linux kernel maintainers.
Avoid mounting untrusted or suspicious filesystem images.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement strict filesystem image validation processes.

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the risk of exploitation.