High severity7.8NVD Advisory· Published May 12, 2026· Updated May 15, 2026
CVE-2026-40397
CVE-2026-40397
Description
Integer underflow (wrap or wraparound) in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40397nvdVendor Advisory
News mentions
3- Patch Tuesday - May 2026Rapid7 Blog · May 13, 2026
- Microsoft Patch Tuesday for May 2026 — Snort rules and prominent vulnerabilitiesCisco Talos Intelligence · May 12, 2026
- Microsoft May 2026 Patch Tuesday fixes 120 flaws, no zero-daysBleepingComputer · May 12, 2026