In the Linux kernel, a medium-severity vulnerability has been identified, which allows for a NULL pointer dereference in the memory management system. The vulnerability, identified as CVE-2023-53401, poses a risk as it can lead to high availability impact due to potential system crashes or hangs. Organizations relying on affected versions of the Linux kernel should take immediate action to patch this vulnerability.
The CVSS score for this vulnerability is 4.7, indicating a medium severity level. The attack vector is local, requiring low privileges and no user interaction, making it relatively easy for an attacker with local access to exploit this vulnerability. The urgency for defenders is significant, as the impact on system availability could lead to severe operational disruptions.
Currently, there is no known public exploit for this vulnerability, but organizations should not underestimate the potential for exploitation given the nature of the issue. It is critical to prioritize patching immediately to safeguard against any unauthorized access or system instability.
Risk to organizations includes operational downtime and potential loss of data integrity. Organizations should assess their exposure to this vulnerability and implement mitigative measures promptly.
Vulnerability Details
In the Linux kernel, this vulnerability allows for a NULL pointer dereference in the function obj_stock_flush_required(). The issue arises from a data race condition that can reset a critical pointer between the check and dereference, potentially leading to system instability. The vulnerability is categorized under CWE-476, indicating a null pointer dereference.
The vulnerability affects the Linux kernel versions from 5.9 up to, but not including, 6.1.45, as well as versions from 6.2 up to, but not including, 6.4.10. Organizations should ensure they are running versions that are patched against this vulnerability.
The publication date for this vulnerability is September 18, 2025, with the last modification noted on January 14, 2026. The official description emphasizes the necessity of using READ_ONCE()/WRITE_ONCE() for all accesses to the affected pointer to mitigate the risk.
Technical Analysis
The root cause of CVE-2023-53401 lies in a race condition within the Linux kernel's memory management subsystem. Specifically, the function obj_stock_flush_required() fails to adequately synchronize access to the cached_objcg pointer, which allows it to be reset during execution. This oversight results in a NULL pointer dereference when another operation attempts to read from the same pointer.
The attack vector is classified as local, meaning that only users with local access to the system can exploit this vulnerability. The attack complexity is high, as it requires specific conditions to trigger the race condition successfully. The privileges required are low, allowing any user with basic access to the system to initiate an attack.
This vulnerability does not require user interaction, making it particularly dangerous for systems with multiple users or processes that could inadvertently trigger the race condition. The confidentiality impact is none, and the integrity impact is also none; however, the availability impact is high, which could lead to serious operational disruptions.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2023-53401 is significant, particularly for organizations that rely heavily on the Linux kernel for critical operations. The nature of this vulnerability means that an attacker with local access can exploit it to cause system crashes or hangs, leading to downtime and potential data loss.
Organizations should assess the potential blast radius of this vulnerability. Systems that utilize the affected versions of the Linux kernel in production environments are at risk, especially those with multiple users or processes running concurrently. This vulnerability exemplifies the importance of maintaining updated systems to mitigate risks.
Given the CVSS score of 4.7, the urgency for addressing this vulnerability should be classified as moderate. Organizations should prioritize it in their patch management cycles, especially if they have systems that are currently running affected versions of the Linux kernel.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following Linux kernel versions are affected by CVE-2023-53401: versions from 5.9 to less than 6.1.45, and from 6.2 to less than 6.4.10. Organizations should ensure that they are running patched versions to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
To remediate CVE-2023-53401, organizations should apply the patches provided in the official Linux kernel updates. It is crucial to upgrade to versions that are not affected by this vulnerability. Additionally, organizations may consider implementing configuration hardening to minimize exposure to potential attacks.
For a comprehensive assessment of vulnerabilities, organizations should conduct regular penetration testing. This proactive approach can help identify and address similar weaknesses before they can be exploited. More information on this can be found in our guide on penetration testing services.
Detection Guidance
Organizations should monitor system logs for indicators of this vulnerability, particularly focusing on unexpected system crashes or instability. Behavioral anomalies that deviate from standard operations may indicate exploitation attempts. It is also advisable to keep an eye out for any unusual memory management behaviors that could suggest the issue is being triggered.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-53401 lies in its demonstration of the critical nature of memory management in kernel development. This vulnerability highlights the importance of rigorous testing and code review processes to prevent similar issues in the future.
Security teams should take note of the trends associated with vulnerabilities in kernel memory management, as they often represent underlying systemic issues in software development practices. The lessons learned from CVE-2023-53401 can inform better practices and improve overall system resilience.
To further enhance security posture, organizations are encouraged to implement proactive measures such as regular security assessments and training for developers on secure coding practices. More information on secure development practices can be found in our blog about secure coding practices.
Additionally, to stay informed on the latest trends in vulnerability management and security practices, organizations should consider subscribing to resources that provide insights and updates in the field. Our resource on the state of application security can be particularly helpful.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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