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CVE-2026-21537

Microsoft Defender for Linux

Microsoft CVSS 8.8 Updated March 15, 2026

Executive Risk Summary

"A code injection vulnerability in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network, potentially leading to system compromise. This vulnerability poses a significant risk to Linux systems running Microsoft Defender, as it could be exploited to gain unauthorized access and control."

Operational Audit Arsenal

Target Type Executable
Target Asset msdefender
Standard Path /usr/lib/msdefender

Manual Verification Required

This is a non-Windows asset (Microsoft). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Likely

Antivirus service affected

Internal Work Notes

High-priority vulnerability in Microsoft Defender for Linux requiring immediate patching to prevent code injection attacks

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Intelligence Sources

Related Microsoft Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.