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Vulnerability DatabaseCVE-2025-38191
CVE-2025-38191:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2025-38191 is a vulnerability discovered in the Linux kernel affecting the ksmbd component. The vulnerability was disclosed on July 4, 2025, and involves a null pointer dereference issue in the destroyprevioussession function (NVD Database).
Technical details
The vulnerability occurs when a client sets ->PreviousSessionId on the kerberos session setup stage. Since sess->user is not set yet at this point, it can pass the user argument as NULL to destroyprevioussession, leading to a null pointer dereference error. The sess->user is normally set in ksmbdkrb5authenticate() (NVD Database).
Impact
The vulnerability can result in a null pointer dereference which could lead to a system crash, potentially causing a denial of service condition (Debian Tracker).
Mitigation and workarounds
The vulnerability has been resolved by moving the call to destroyprevioussession() after ksmbdkrb5authenticate(). This ensures that sess->user is properly set before the destroyprevioussession function is called (NVD Database).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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