SB2025021191 - Multiple vulnerabilities in Microsoft Windows Resilient File System (ReFS) Deduplication Service

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Double free (CVE-ID: CVE-2025-21183)

The vulnerability allows a local attacker to escalate privileges on the system.

The vulnerability exists due to a boundary error in Windows Resilient File System (ReFS) Deduplication Service. A local attacker can win a race condition, trigger double free error and gain elevated privileges on the target system.

2) Double free (CVE-ID: CVE-2025-21182)

The vulnerability allows a local attacker to escalate privileges on the system.

The vulnerability exists due to a boundary error in Windows Resilient File System (ReFS) Deduplication Service. A local attacker can win a race condition, trigger double free error and gain elevated privileges on the target system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21183
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21182