CVE-2018-20855 : What You Need to Know

A problem was found in the Linux kernel prior to version 4.18.7, leading to a memory leak vulnerability.

Understanding CVE-2018-20855

This CVE identifies a vulnerability in the Linux kernel that could expose stack memory to userspace due to improper initialization of a variable.

What is CVE-2018-20855?

In the create_qp_common function in drivers/infiniband/hw/mlx5/qp.c, the mlx5_ib_create_qp_resp variable was not correctly initialized, potentially allowing unauthorized access to sensitive information.

The Impact of CVE-2018-20855

The vulnerability could be exploited by attackers to access stack memory, potentially leading to unauthorized disclosure of sensitive data.

Technical Details of CVE-2018-20855

This section provides more detailed technical information about the CVE.

Vulnerability Description

The issue lies in the create_qp_common function in drivers/infiniband/hw/mlx5/qp.c, where the mlx5_ib_create_qp_resp variable is not properly initialized, resulting in a memory leak.

Affected Systems and Versions

Affected systems: Linux kernel versions prior to 4.18.7
Affected components: drivers/infiniband/hw/mlx5/qp.c

Exploitation Mechanism

The vulnerability allows attackers to access stack memory by exploiting the uninitialized variable, potentially leading to unauthorized data exposure.

Mitigation and Prevention

Protecting systems from CVE-2018-20855 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update to Linux kernel version 4.18.7 or newer to mitigate the vulnerability
Monitor for any unauthorized access or unusual activities on the system

Long-Term Security Practices

Regularly apply security patches and updates to the Linux kernel
Implement access controls and restrictions to prevent unauthorized access to sensitive data

Patching and Updates

Stay informed about security advisories and updates from Linux kernel maintainers
Apply patches promptly to address known vulnerabilities and enhance system security