In the Linux kernel, a vulnerability has been identified that allows access to NAPI instances across different namespaces. This is significant because the NAPI IDs were not fully exposed to user space prior to the implementation of the netlink API. As a result, the netlink API must ensure that each NAPI instance belongs to the same network namespace (netns) as the owner of the generic netlink socket. The vulnerability has been classified with a CVSS score of 5.5, placing it in the medium severity level. This indicates that while the vulnerability does not allow for confidentiality or integrity impacts, it poses a significant risk to availability.
Risk to organizations includes potential service disruptions due to the high availability impact. As such, organizations leveraging affected Linux kernel versions should prioritize patching to mitigate this risk. The vulnerability was published on January 21, 2025, and has been analyzed, indicating that remediation steps are available.
Given the medium severity and potential impacts, organizations should address this vulnerability in their priority patch cycle.
No public exploit has been confirmed for this vulnerability; however, organizations should remain vigilant.
Vulnerability Details
The vulnerability allows unauthorized access to NAPI instances from another namespace, which can lead to availability issues. The CVSS vector string for this vulnerability is 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H', which indicates a local attack vector with low complexity and low privileges required.
Affected versions of the Linux kernel are from version 6.8 up to, but not including, 6.12.10. Specific release candidates of version 6.13 are also affected.
Technical Analysis
The root cause of this vulnerability stems from improper handling of NAPI instance IDs in the Linux kernel. Prior to the netlink API, these IDs were not namespaced, allowing potential access from other namespaces. The attack vector is local, with low complexity and low privileges required. No user interaction is necessary, and while there is no confidentiality or integrity impact, the availability impact is classified as high.
Risk & Impact Analysis
Organizations utilizing affected versions of the Linux kernel should assess the risk of service disruption due to this vulnerability. The availability impact is high, which could lead to significant operational challenges if exploited. The vulnerability remains unexploited in the wild as of the last update, but the potential for future exploitation exists.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all Linux kernel versions from 6.8 up to, but not including, 6.12.10. Additionally, it impacts specific release candidates of version 6.13.
Mitigation & Remediation
Organizations should upgrade to the latest stable version of the Linux kernel that addresses this vulnerability. The patched versions should ideally be implemented in the next scheduled maintenance window. For those unable to apply the patch immediately, alternative security controls should be considered, including restricting access to affected systems and monitoring network activity for unusual behavior.Continuous penetration testing can also help identify potential weaknesses in the systems.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should implement log monitoring for any unauthorized access attempts to NAPI instances. Additionally, monitoring for unusual network traffic patterns that could indicate attempts to access NAPI instances from different namespaces can provide early warning of an attack.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to disrupt services due to high availability impact. This highlights the need for organizations to prioritize timely patching of vulnerabilities, especially in widely used components like the Linux kernel. Security teams should consider implementing a robust vulnerability management program to ensure all systems are promptly updated. The lessons learned from this incident reinforce the importance of proactive security measures and can help prevent similar vulnerabilities in the future.Designing a vulnerability management program that addresses such vulnerabilities is critical.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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