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CVE-2025-50170 is a high-severity local privilege escalation vulnerability in Microsoft Windows Cloud Files Mini Filter Driver (cldflt.sys). The flaw is described as a logic error in placeholder file creation. Through the user-mode API cldapi.dll!CfCreatePlaceholders(), user input reaches cldflt.sys!HsmpOpCreatePlaceholders(), where the kernel creates an MDL from a user-supplied pointer and probes it with IoReadAccess, but later writes FILE_BASIC_INFORMATION data to that same user-controlled address at offset 0x10 and an error status at offset 0x40 without verifying write access. This mismatch allows an attacker to supply a mapping of a read-only victim file and have the kernel overwrite it. The report further states that internal validations can be bypassed by placing a writable 0x10000-byte region immediately before the read-only victim mapping and passing victimView - 0x40 as the pointer, causing kernel writes to land at the start of the victim file. Because cldflt.sys underpins cloud-backed file functionality such as OneDrive, an authorized low-privilege local attacker can abuse this condition to corrupt arbitrary files and potentially achieve code execution as SYSTEM.
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