In the Linux kernel, a medium-severity vulnerability identified as CVE-2024-26735 has been reported. This vulnerability allows for a use-after-free and null-pointer dereference in the IPv6 subsystem, which can lead to potential system instability and denial of service. The issue arises because the pernet operations structure must be registered before the generic netlink family is registered, which was not adequately handled.
The vulnerability has a CVSS score of 5.5, indicating a medium level of severity. Organizations using affected Debian Linux kernel versions should be aware of the potential risks associated with this vulnerability, especially given its local attack vector. It is important for organizations to prioritize patching this vulnerability to maintain system integrity and availability.
As of now, there are no known exploits in the wild targeting this vulnerability, but the potential impacts highlight the need for timely remediation. Organizations should take immediate action to address this vulnerability in their systems.
Organizations should prioritize patching immediately.
Vulnerability Details
The CVE-2024-26735 vulnerability is related to the Linux kernel's IPv6 subsystem. The vulnerability has been officially described as a fix for possible use-after-free and null-pointer dereferences. The CVSS score of 5.5 indicates that while the vulnerability is medium in severity, it still poses a risk to system availability.
The affected products include various firmware components such as the 8300_firmware, 8700_firmware, and others, as well as the Debian Linux operating system itself. The vulnerability has been publicly documented since April 3, 2024.
Technical Analysis
The root cause of this vulnerability lies in how the Linux kernel handles pernet operations for the IPv6 subsystem. If the operations structure is not registered properly before the generic netlink family registration, it can lead to improper memory management, resulting in either a use-after-free scenario or a null pointer dereference.
The attack vector for this vulnerability is local, meaning that an attacker must have local access to the system to exploit it. The complexity of the attack is low, and it requires low privileges, which means that even users with minimal access could potentially exploit the vulnerability without requiring user interaction. The impacts on confidentiality and integrity are none, but the availability impact is high, which could lead to system crashes or service interruptions.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2024-26735 is significant, given its potential to crash systems and disrupt services. Organizations using affected Debian Linux kernel versions, particularly those in critical environments, should assess their risk exposure.
The blast radius for this vulnerability includes any system running the affected versions of the Linux kernel, which could lead to widespread service disruptions. Given the CVSS score of 5.5, organizations should address this vulnerability in their priority patch cycle, as it poses a moderate risk that can be exploited locally.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions are affected by CVE-2024-26735: Linux kernel versions from 4.10 to 4.19.308, 4.20 to 5.4.270, 5.5 to 5.10.211, 5.11 to 5.15.150, 5.16 to 6.1.80, 6.2 to 6.6.19, and 6.7 to 6.7.7. Additionally, Debian Linux version 10.0 is also affected.
Mitigation & Remediation
Organizations should ensure they apply the necessary patches to mitigate the risks associated with this vulnerability. The recommended course of action is to upgrade to the latest version of the Linux kernel and Debian Linux that addresses this issue.
In addition to upgrading, organizations can implement configuration hardening practices, such as restricting local access to critical systems and monitoring for any suspicious activity that may indicate attempts to exploit this vulnerability.
For further guidance, organizations can refer to resources on penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor system logs for indicators of exploitation attempts, such as unusual memory access patterns or application crashes. Behavioral anomalies in system performance can also serve as signals of potential exploitation.
Network signatures associated with this vulnerability could include unexpected traffic patterns originating from local users. It is advisable to implement monitoring solutions that can detect such anomalies.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-26735 lies in its representation of systemic issues within the Linux kernel's memory management practices. This highlights the importance of rigorous testing and validation processes to prevent similar vulnerabilities from emerging.
Organizations should learn from this incident to enhance their security frameworks and adopt proactive measures. Regular audits and updates to the security posture will be critical in mitigating risks associated with vulnerabilities.
For additional reference on continuous security measures, organizations can explore application security assessments and continuous penetration testing to maintain an effective defensive posture.
Additionally, organizations should consider leveraging red teaming services for comprehensive security testing and vulnerability identification.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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