May 2026: Windows Volume Manager Extension Driver Remote Code Execution Vulnerability
CVE-2026-40380 Published on May 12, 2026

Windows Volume Manager Extension Driver Remote Code Execution Vulnerability
Heap-based buffer overflow in Volume Manager Extension Driver allows an authorized attacker to execute code with a physical attack.

Vendor Advisory NVD

Weakness Types

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Out-of-bounds Read

The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.

Numeric Truncation Error

Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion. When a primitive is cast to a smaller primitive, the high order bits of the large value are lost in the conversion, potentially resulting in an unexpected value that is not equal to the original value. This value may be required as an index into a buffer, a loop iterator, or simply necessary state data. In any case, the value cannot be trusted and the system will be in an undefined state. While this method may be employed viably to isolate the low bits of a value, this usage is rare, and truncation usually implies that an implementation error has occurred.


Products Associated with CVE-2026-40380

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Microsoft Windows 10
 
Microsoft Windows Server 2019
 
Microsoft Windows Server 2022
 
Microsoft Windows Server 2025
 
Microsoft Windows 11 25h2
 
Microsoft Windows 11 23h2
 
Microsoft Windows Server 23h2
 
Microsoft Windows 11 24h2
 
Microsoft Windows 11 26h1
 
Microsoft Windows Server 2016
 
Microsoft Windows Server 2012
 
Microsoft Windows Server 2012 R2
 

Affected Versions

Microsoft Windows 10 Version 1607: Microsoft Windows 10 Version 1809: Microsoft Windows 10 Version 21H2: Microsoft Windows 10 Version 22H2: Microsoft Windows 11 version 22H3: Microsoft Windows 11 Version 23H2: Microsoft Windows 11 Version 24H2: Microsoft Windows 11 Version 25H2: Microsoft Windows 11 version 26H1: Microsoft Windows Server 2012: Microsoft Windows Server 2012 (Server Core installation): Microsoft Windows Server 2012 R2: Microsoft Windows Server 2012 R2 (Server Core installation): Microsoft Windows Server 2016: Microsoft Windows Server 2016 (Server Core installation): Microsoft Windows Server 2019: Microsoft Windows Server 2019 (Server Core installation): Microsoft Windows Server 2022: Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): Microsoft Windows Server 2025: Microsoft Windows Server 2025 (Server Core installation):