CVE-2026-69421

Integer underflow (wrap or wraparound) in Windows Kernel Mode Driver allows an authorized attacker to elevate privileges locally.

  • Published Sep 8, 2026
  • CVSS 7.8 high
  • 0.3% chance of exploitation in the next 30 days (EPSS)
  • A fix is available

Affected software

CVE-2026-69421 at the National Vulnerability Database