In the Linux kernel, a vulnerability has been identified in the netfilter component, specifically in the nf_tables functionality. This vulnerability allows a situation where a rule could reference a deleted chain when a rule is added to a chain by its ID. Such a condition can lead to warnings and potential instability in the kernel.
The CVSS score for this vulnerability is 7.8, categorizing it as high severity. This rating indicates significant risk to organizations, especially those utilizing Linux systems in critical environments. The exploitation of this vulnerability can lead to various impacts, including compromised system integrity and availability.
Organizations should prioritize patching immediately to mitigate this vulnerability and protect their systems from potential exploitation.
As of now, there are no known public exploits, and the vulnerability is not listed in the KEV catalog. However, given the high score, it is crucial for organizations to remain vigilant.
Vulnerability Details
The vulnerability manifests when rules are added to chains by their ID, and those chains have been deleted in the same operational batch. The system may throw warnings, which indicates that management of chain states is compromised.
The affected versions include Linux Kernel versions from 5.9 to below 5.10.188, 5.11 to below 5.15.121, 5.16 to below 6.1.39, and 6.2 to below 6.4.4, as well as the 6.5:rc1 version.
This vulnerability is categorized under the high severity level due to its potential impacts on confidentiality, integrity, and availability.
Technical Analysis
The root cause of this issue is related to the inability of the nft_chain_lookup_byid function to properly account for the genmask when chains are deleted. Consequently, if a rule is added referring to a deleted chain, it can lead to system instability and errors.
The attack vector is local, which means that an attacker must have local access to exploit this vulnerability. The attack complexity is low, requiring minimal effort to trigger the warning and potentially cause system issues.
In terms of required privileges, the attacker needs low privileges, and there is no user interaction required for exploitation. The impact on confidentiality, integrity, and availability is high, indicating that successful exploitation can severely compromise the system.
Risk & Impact Analysis
The real-world risk associated with this vulnerability is significant, particularly for organizations utilizing Linux in critical infrastructure. The potential to reference deleted chains can lead to unexpected behaviors, which may not only disrupt services but also allow unauthorized access or manipulation of data.
Given the high severity score and the potential impact, organizations deploying affected versions of the Linux kernel should prioritize remediation efforts. The urgency is underscored by the fact that local access is a requirement, which may allow attackers with legitimate access to exploit this vulnerability.
The blast radius is considerable, particularly for systems where kernel-level access is common. Organizations should be aware of the potential for increased attack vectors and ensure that security measures are in place.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of the Linux kernel are affected by this vulnerability: 5.9 to below 5.10.188, 5.11 to below 5.15.121, 5.16 to below 6.1.39, 6.2 to below 6.4.4, and 6.5:rc1. Organizations should ensure that they are running patched versions.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest patches provided by the Linux kernel maintainers. Ensure that systems are updated to unaffected versions immediately.
If patches are not immediately available, organizations may need to implement temporary workarounds, such as restricting local access to systems or disabling certain netfilter functionalities until a complete patch can be applied.
For further guidance, organizations can explore resources on penetration testing strategies that can help identify vulnerabilities.
Detection Guidance
Monitoring for unusual warnings related to nf_tables can help in early detection of exploitation attempts. Logs should be reviewed for entries related to chain deletions and additions.
Behavioral anomalies within the kernel's networking stack should be closely monitored, and any unexpected system behavior should be investigated thoroughly.
AppSecure Threat Intelligence Insight
The vulnerability in the Linux kernel showcases the importance of rigorous management of chain states and rule references. It serves as a reminder for security teams to continuously monitor and update their systems.
In the context of increasing local vulnerabilities, the need for robust security practices is paramount. Organizations should consider implementing stricter access controls and proactive monitoring.
For more insights on improving security postures, refer to our resources on penetration testing methodology and vulnerability management program design to strengthen defenses.
Additionally, understanding the patterns of vulnerabilities can inform better architectural decisions and promote a culture of security within development teams.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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