SB2025101536 - Multiple vulnerabilities in Microsoft Windows Resilient File System (ReFS)

Description

This security bulletin contains information about 2 vulnerabilities.

1) Race condition (CVE-ID: CVE-2025-55687)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

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

The vulnerability exists due to a race condition in Windows Resilient File System (ReFS). A local attacker can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

2) Use-after-free (CVE-ID: CVE-2025-59206)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Resilient File System (ReFS). A local attacker can win a race condition 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-2025-55687
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-59206