Oct 2025: Microsoft Defender for Linux Denial of Service Vulnerability
CVE-2025-59497 Published on October 14, 2025
Microsoft Defender for Linux Denial of Service Vulnerability
Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.
Weakness Type
What is a TOCTTOU Vulnerability?
The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state. This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.
CVE-2025-59497 has been classified to as a TOCTTOU vulnerability or weakness.
Products Associated with CVE-2025-59497
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Affected Versions
Microsoft Defender for Endpoint for Linux:- Version 101.0.0 and below 101.25032.0010 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.