In the Linux kernel, a vulnerability has been resolved that allows for potential leakage of kernel memory contents. This vulnerability results from a packet length that can be larger than the actual socket buffer length, which may lead to unauthorized access to sensitive information. The CVE-2023-53125 has a CVSS score of 5.5, categorizing it as medium severity. This classification is critical as it indicates a real-world risk to organizations relying on affected versions of the Linux kernel.
The exploitation of this vulnerability can lead to significant consequences, specifically affecting the availability of services using the impacted kernel versions. Attackers may leverage this flaw to access sensitive kernel memory, which underscores the urgency for organizations to prioritize patching immediately.
Given the potential impacts, it is paramount for organizations to assess their environments for usage of vulnerable Linux kernel versions. Continuous monitoring and timely updates are essential to mitigate the risks associated with this vulnerability.
Understanding the vulnerability's characteristics, including its attack vector and the necessary privileges required for exploitation, is critical for an effective response. This vulnerability requires local access, indicating that it may be more relevant in environments where untrusted users have access to the system.
Organizations should conduct a thorough analysis of their systems to identify any instances of the affected Linux kernel versions and implement necessary patches without delay.
Vulnerability Details
The vulnerability, identified as CVE-2023-53125, impacts the Linux kernel due to a flaw in the handling of packet lengths in the usb: smsc75xx driver. The official CVE description states: 'Packet length retrieved from skb data may be larger than the actual socket buffer length (up to 9026 bytes). In such case, the cloned skb passed up the network stack will leak kernel memory contents.' This situation poses a significant risk to the confidentiality and integrity of data being processed by the kernel.
The CVSS score of 5.5 reflects a medium severity, with specific metrics indicating that the attack vector is local, complexity is low, and privileges required are low. The availability impact is notably high, which could lead to service disruptions if exploited.
The vulnerability was published on May 2, 2025, and is classified under CWE-401. It is essential for organizations utilizing the Linux kernel to monitor and manage their deployments effectively.
Technical Analysis
The root cause of CVE-2023-53125 lies in the mishandling of packet length in the network stack, specifically in the usb: smsc75xx driver. The attack vector is local, meaning an attacker must have local access to the system to exploit this vulnerability. The attack complexity is low, as it does not require any sophisticated techniques or significant effort to exploit.
The privileges required for exploitation are low, allowing a local attacker to execute an attack without needing special access. User interaction is not required, which further enhances the risk profile of this vulnerability.
The impact on confidentiality is none, as there is no unauthorized access to sensitive information. However, the integrity impact is also none, meaning the data remains unchanged. The availability impact is high, which could lead to service outages or degraded performance if the vulnerability is successfully exploited.
Risk & Impact Analysis
Risk to organizations includes potential service disruption due to high availability impact. The vulnerability may not directly compromise data confidentiality or integrity, but it does pose a significant risk to system availability, which is critical for operational stability.
Organizations utilizing the affected Linux kernel versions should consider the potential blast radius of this vulnerability. The ease of exploitation, combined with the local attack vector, suggests that environments with shared access should be prioritized for remediation.
Given the medium CVSS score and the absence of known exploitation, organizations should address this vulnerability in their priority patch cycle. Continuous monitoring and assessment of the environment will be key in mitigating the risks associated with this vulnerability.
Exploitation Status
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: - All versions from 2.6.35 to prior to 4.14.311 - All versions from 4.15 to prior to 4.19.279 - All versions from 4.20 to prior to 5.4.238 - All versions from 5.5 to prior to 5.10.176 - All versions from 5.11 to prior to 5.15.104 - All versions from 5.16 to prior to 6.1.21 - All versions from 6.2 to prior to 6.2.8 - Specific releases of 2.6.34 - Specific releases of 6.3
Mitigation & Remediation
Organizations should ensure that they apply the latest patches to their Linux kernel installations. Patches addressing CVE-2023-53125 are available, and immediate application is recommended to mitigate this vulnerability. For those unable to apply patches immediately, implementing configuration hardening and network controls can help reduce the risk of exploitation. Continuous monitoring should also be conducted to detect any anomalies or attempted exploitation.
For further information on effective security testing strategies, organizations can consider engaging in penetration testing to identify and remediate similar vulnerabilities.
Detection Guidance
Monitoring logs for indicators of exploitation attempts is crucial. Organizations should look out for any anomalous behavior in network communications related to kernel processes. Behavioral anomalies, such as unexpected packet sizes or unusual memory access patterns, can serve as indicators of attempted exploitation. Additionally, implementing network signatures that identify malicious traffic patterns can further enhance detection capabilities.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-53125 highlights the importance of robust packet handling within kernel modules. The patterns observed from this vulnerability indicate the necessity for continuous monitoring and proactive vulnerability management in kernel development practices. Security teams should take this as a lesson to strengthen their practices around packet validation and access controls.
Organizations should consider reviewing their security testing methodologies and ensure they incorporate comprehensive checks for vulnerabilities similar to CVE-2023-53125. Engaging in penetration testing methodology can enhance their ability to detect and remediate such security flaws effectively.
This vulnerability serves as a reminder for organizations to prioritize the implementation of rigorous security practices to stay ahead of potential threats, particularly in critical infrastructure environments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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