Aug 2026: Windows Common Log File System Driver Elevation of Privilege Vulnerability
CVE-2026-62728 Published on August 11, 2026
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Weakness Types
What is a TOCTTOU Vulnerability?
The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state. This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.
CVE-2026-62728 has been classified to as a TOCTTOU vulnerability or weakness.
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.
Products Associated with CVE-2026-62728
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Affected Versions
Microsoft Windows 10 Version 1607:- Version 10.0.14393.0 and below 10.0.14393.9418 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9115 is affected.
- Version 10.0.19044.0 and below 10.0.19044.7663 is affected.
- Version 10.0.19045.0 and below 10.0.19045.7663 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7517 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7517 is affected.
- Version 10.0.26100.0 and below 10.0.26100.9168 is affected.
- Version 10.0.26200.0 and below 10.0.26200.9168 is affected.
- Version 10.0.28000.0 and below 10.0.28000.2704 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26279 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26279 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23337 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23337 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9418 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9418 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9115 is affected.
- Version 10.0.17763.0 and below 10.0.17763.9115 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5499 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33296 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33296 is affected.