Understanding CVE-2021-35939: A Guide for Businesses

In the rapidly evolving world of cybersecurity, staying informed about potential vulnerabilities is crucial for any organization committed to safeguarding its data and systems. One such vulnerability that has captured attention is CVE-2021-35939. This medium severity vulnerability, rated 6.7 out of 10, underscores the importance of continuous vigilance and regular patch management.

About the Software and Vulnerability

CVE-2021-35939 is associated with unresolved issues from previous vulnerabilities, specifically CVE-2017-7500 and CVE-2017-7501. These vulnerabilities were found in certain Linux distributions. Linux, a widely used open-source operating system, is known for its robustness and flexibility across various computing environments which makes it a favorite in both web servers and personal computers.

The aim of Linux is to provide a free and lightweight alternative for both personal and professional use. However, being highly customizable and with extensive user permissions, Linux can be susceptible to such vulnerabilities if not properly patched or updated.

What Makes CVE-2021-35939 Significant?

The CVE-2021-35939 vulnerability stems from an incomplete fix related to directory file creation permissions. Originally attempting to patch earlier exploits that allowed unauthorized data access, this newer vulnerability does not fully secure the parent directory creation check. As a result, a local user with limited privileges who has control over any ancestor directory could exploit this flaw to potentially gain root access. The consequences of such an exploit could lead to compromised data confidentiality, integrity, and overall system availability.

Implications for Your Business

The potential for a local user to escalate privileges spells significant risk not just in terms of data breach but also in potential operational downtime. For businesses, this vulnerability requires immediate attention to mitigate any possibility of insider threats or exploitation by malware that might already exist on the network undetected.

Proactive Measures to Protect Your Systems

Addressing CVE-2021-35939 effectively requires businesses to implement comprehensive patch management strategies. Regular updates and patches are not just recommended but essential in safeguarding against vulnerabilities that could be exploited.

A specialized tool like Linux Patch, a dedicated patch management platform for Linux servers, provides an invaluable service. It helps automate the patching process, ensuring that all updates are administered promptly and consistently, minimizing the risk window that vulnerabilities like CVE-2021-35939 present.

Utilizing such tools not only enhances your cybersecurity posture but also saves valuable IT resources, allowing your team to focus on other critical aspects of your business operations.


While CVE-2021-35939 presents a clear threat, the availability of effective tools like Linux Patch simplifies the process of vulnerability management. Remember, the cost of prevention is always less than the cost of a breach. Stay vigilant, stay updated, and prioritize your systems' security by choosing reliable patch management solutions.

Act Now: Secure Your Linux Environment

Do not wait for a breach to happen. Visit Linux Patch today to secure your Linux servers against vulnerabilities like CVE-2021-35939. Being proactive is the key to maintaining a robust cybersecurity framework in your organization.