CVE-2026-34332Important
Windows Kernel-Mode Driver Remote Code Execution Vulnerability
Assessment
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.
- Severity
- Important
- CVSS base score
- 8.0CVSS:3.1/
AV:N/ AC:L/ PR:L/ UI:R/ S:U/ C:H/ I:H/ A:H/ E:U/ RL:O/ RC:C - Impact
- Remote Code Execution
- EPSS, next 30 days
- 0.8%Higher than 53.8% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Unlikely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Windows Kernel-Mode Drivers
- Weakness
- CWE-416: Use After Free
- Issued by
- Microsoft
- Published
- 12 May 2026 · May 2026
- Last revised
- 12 May 2026
Updates that fix it
2 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5087423 | Security Hotpatch Update | Required | Windows Server 2025, Windows Server 2025 (Server Core installation) | All CVEs in KB5087423 |
| KB5087539 | Security Update | Required | Windows Server 2025, Windows Server 2025 (Server Core installation) | All CVEs in KB5087539 |