CVE-2023-54148 pertains to a vulnerability in the Linux kernel, specifically within the network management module. The vulnerability has been documented to affect the handling of network encapsulations in ECMP (Equal-Cost Multipath) mode, leading to a potential use-after-free condition. This issue arises when the flow is duplicated to the peer eswitch, resulting in improper cleanup and access to cleaned-up neighbor information.
The severity of this vulnerability is currently classified as unknown, which necessitates careful attention from organizations utilizing the affected kernel. Even though the issue has a deferred status, it is critical to understand the risk to organizations includes potential exploitation avenues that could compromise network integrity.
As of now, there is no confirmed public exploit available, and the vulnerability is not categorized under the Known Exploited Vulnerability (KEV) framework. Organizations should prioritize monitoring updates related to this vulnerability and consider the implications of unpatched systems.
Urgency for defenders is moderate. Organizations should schedule remediation as part of their routine maintenance, particularly for systems relying on the Linux kernel for network operations.
Vulnerability Details
The official description of this vulnerability is as follows: In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Move representor neigh cleanup to profile cleanup_tx. For IP tunnel encapsulation in ECMP mode, the related neighbor information on the peer uplink representor is created as well. The commit moves eswitch devcom unpair to the uplink unload API, specifically the profile->cleanup_tx.
The vulnerability affects all versions of the Linux kernel prior to the applicable patches and is associated with a use-after-free error that can occur under specific conditions related to the unloading of the driver. The publication date of this vulnerability is December 24, 2025.
Technical Analysis
The root cause of the vulnerability stems from improper management of resources during network encapsulation processes. When the unloading of an eswitch driver occurs, the corresponding cleanup process can incorrectly access freed memory, leading to a use-after-free condition. The attack vector is classified as local, with a low attack complexity, meaning that an attacker with local access could exploit this flaw.
The vulnerability requires low privileges to exploit, as it pertains to network operations that can be triggered without elevated permissions. User interaction is not required for exploitation, making it more accessible to potential attackers. The confidentiality, integrity, and availability impacts are currently assessed as low, given the lack of verified exploits.
Risk & Impact Analysis
Organizations deploying the Linux kernel in environments that utilize ECMP mode should assess their exposure to this vulnerability. The risk to organizations includes potential network disruptions and unauthorized access if the vulnerability is exploited. It is crucial to consider the blast radius, especially in environments where multiple peers are interconnected.
Given the current CVSS score is not officially scored, organizations must rely on internal risk assessments to determine the urgency of remediation. However, with the EPS score being low (0.00025), organizations can gauge that the immediate threat level is not high, allowing for a scheduled approach to patch management.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected. As the patch details are not specified in the current data, organizations should refer to the Linux kernel's update logs for patch availability.
Mitigation & Remediation
Organizations should monitor for patches related to CVE-2023-54148 and apply them as soon as they are available. In the absence of a patch, organizations can enhance their security posture by reviewing network configurations and ensuring that all encapsulation rules are applied correctly. Regular updates and contingency measures should be put in place to address potential vulnerabilities.
For further information on penetration testing and vulnerability management, organizations can refer to penetration testing services that provide insights into potential exploitation avenues.
Detection Guidance
Monitoring for unusual network behavior and logging indicators related to neighbor entry releases can help in detecting potential exploitation attempts. Organizations should review system logs for anomalies associated with the unloading of network drivers and any related cleanup operations.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-54148 highlights the need for robust network management practices in the Linux kernel environment. As vulnerabilities like this could lead to severe network disruptions, security teams should learn from this incident to fortify their defenses. Proactive measures include regular audits of network configurations and a comprehensive penetration testing methodology to identify potential weaknesses.
Additionally, organizations should consider the importance of a vulnerability management program that addresses such vulnerabilities in a timely manner.
In conclusion, this vulnerability serves as a reminder for organizations to continuously assess their security posture and to remain vigilant against potential vulnerabilities in the technology stack.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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