An issue was discovered in net/netfilter/nf_tables_api.c within the Linux kernel prior to version 5.19.6. This vulnerability allows a denial of service to occur when attempting to bind to an already bound chain. The associated CVSS score for this vulnerability is 5.5, indicating a medium severity level, which necessitates attention from system administrators and security teams.
The risk to organizations includes potential service disruption due to the denial of service condition, which could affect the availability of critical systems. Additionally, since this vulnerability requires low privileges and can be exploited locally, it poses a significant risk to systems where the Linux kernel is deployed.
Organizations should prioritize patching immediately to prevent any potential exploits that could lead to service interruptions. Given the widespread use of the Linux kernel, failure to address this vulnerability could result in broad impacts across various sectors.
As of now, there are no public exploits confirmed for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) catalog. However, the risk persists, and organizations should remain vigilant.
Vulnerability Details
The vulnerability described as CVE-2022-39190 affects the Linux kernel versions prior to 5.19.6. Specifically, it arises from issues within the nf_tables API, which is part of the netfilter subsystem used for packet filtering and network address translation.
According to the CVSS 3.1 vector, the attack vector is local, requiring low privileges. The attack complexity is also low, indicating that it can be exploited without extensive skill or preparation. The availability impact is high, meaning that successful exploitation could lead to significant service disruptions.
The vulnerability was published on September 2, 2022, and has been classified without a specific CWE due to its general nature. The Linux kernel is a fundamental component for many operating systems, particularly in server and cloud environments.
Technical Analysis
The root cause of CVE-2022-39190 stems from inadequate checks within the nf_tables API, allowing an attacker with local access to bind to a chain that is already bound. This oversight can lead to a denial of service, impacting the availability of networking features provided by the kernel.
Given the local attack vector, an attacker must have access to the system to exploit this vulnerability. The attack complexity is low, meaning that there are no significant barriers to exploitation. No user interaction is required for exploitation, which further increases the risk.
This vulnerability impacts confidentiality and integrity minimally, as there are no impacts reported in these areas. However, the high availability impact signifies that systems can become unresponsive or fail to process network traffic effectively.
Risk & Impact Analysis
Organizations using affected versions of the Linux kernel should assess their exposure to this vulnerability. Given the local nature of the vulnerability, the blast radius may be limited to systems where local access can be obtained, but the implications can be significant in multi-user environments.
In terms of urgency, organizations should address this vulnerability in their priority patch cycle. The medium CVSS score of 5.5 indicates that while it is not the highest priority, it is significant enough to warrant timely remediation.
The lack of known exploits signifies that attackers have not yet actively exploited this vulnerability in the wild; however, the potential for exploitation exists, and organizations should be proactive in their defense strategies.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of the Linux kernel prior to 5.19.6. Additionally, Debian Linux version 10.0 is identified as vulnerable. Organizations should ensure that their systems are upgraded to the latest versions to mitigate risks associated with this vulnerability.
Mitigation & Remediation
Organizations should apply the relevant patches provided by the Linux kernel team to remediate this vulnerability. The latest version, 5.19.6, contains fixes that address the issues associated with CVE-2022-39190. For detailed patch information, refer to the vendor advisory and change logs available on their site.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual binding attempts to network chains. Additionally, behavioral anomalies related to network connections should be investigated. Regular audits of configurations and access controls can help mitigate the risks associated with this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-39190 lies in its representation of vulnerabilities within widely used components like the Linux kernel. Security teams should consider this incident as a reminder to prioritize regular updates and patch management. The potential for denial of service attacks highlights the importance of maintaining secure configurations and access controls within local environments.
Organizations can enhance their security posture by implementing a robust vulnerability management program to identify and address similar weaknesses proactively.
Further, organizations should consider engaging in penetration testing to evaluate their defenses and ensure that systems are hardened against potential threats.
As vulnerabilities like CVE-2022-39190 emerge, it is crucial for organizations to stay informed and adapt their security strategies accordingly, utilizing resources such as penetration testing reports to guide their remediation efforts.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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