In the Linux kernel, a vulnerability has been identified relating to a race condition in the ksmbd module. If a client sends multiple session setup requests to ksmbd, this can lead to a Preauh_HashValue race condition. The vulnerability is classified with a CVSS score of 4.7, indicating a medium severity level. The potential risk to organizations includes local exploitation of this vulnerability, which could lead to availability issues.
Organizations should prioritize patching immediately to address this vulnerability. While the exploitability is medium, the potential impact on system availability can have significant consequences, especially in environments where session handling is critical.
The vulnerability has been confirmed to have an available exploit, which increases the urgency for organizations to apply the necessary updates. It is important to note that this issue was resolved in various patches released by the Linux community.
Given the nature of this vulnerability, organizations utilizing Debian or Linux kernel versions affected by this issue must ensure they are updated to the latest stable releases to mitigate any risk.
Vulnerability Details
The vulnerability allows for a race condition that can occur during the session setup phase if multiple requests are sent simultaneously. The fix implemented ensures that the Preauh_HashValue is freed only during the connection termination phase, rather than during session setup.
The vulnerability is classified under CWE-362, which pertains to race conditions. The specific versions of the Linux kernel and Debian affected include various ranges leading up to the patches that have been released.
Technical Analysis
The root cause of this vulnerability is due to improper handling of session setup requests in the ksmbd module of the Linux kernel. The attack vector is local, which means an attacker must have access to the local network to exploit this vulnerability.
The attack complexity is considered high, requiring low privileges and no user interaction. The impacts on availability are significant, with potential for service disruption or denial of service.
Risk & Impact Analysis
Risk to organizations includes potential service interruptions or outages due to the availability impact of this vulnerability. The blast radius is primarily confined to local network segments where the affected systems reside.
Organizations should address this vulnerability in their priority patch cycle, considering the medium severity rating and the exploit availability. The significance of this vulnerability is underscored by the potential for local exploitation, emphasizing the need for swift remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include various ranges of the Linux kernel, specifically those prior to version 6.1.148, 6.6.102, 6.12.42, and 6.15.10. Debian Linux version 11.0 is also impacted. Organizations should ensure they are running the latest patched versions.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the available patches as soon as possible. For those unable to upgrade immediately, consider implementing network segmentation to limit access to systems running vulnerable versions. Configuration hardening and continuous monitoring are also recommended to detect any abnormal behavior.
Organizations may validate remediation through penetration testing to ensure that similar vulnerabilities are not present.
Detection Guidance
Monitoring for unusual session setup requests and logging anomalies are essential. Organizations should analyze logs for any signs of multiple session setups and ensure that any requests are legitimate.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of robust session management in network protocols. Continuous security assessments, such as those outlined in the penetration testing methodology, can help organizations identify similar weaknesses.
Moreover, security teams should stay abreast of evolving vulnerabilities and trends through resources like the vulnerability management program to fortify their defenses against such issues.
Investing in comprehensive security training can also empower teams to better understand and address the risks associated with vulnerabilities like CVE-2025-38561.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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