CVE 2026 20820 Root Cause Analysis

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Status: integrated Integrated into: CVE-2026-20820

Excerpt

CVE-2026-20820 is a vulnerability in the Common Log File System (CLFS) driver that was included in the January 2026 Patch Tuesday. The advisory lists it as a heap overflow that can be used for EoP. CLFS.sys has a rich history of vulnerabilities and exploits, but a lot of them historically have involved modifying or corruptin…