CVE-2026-20809
7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: secure@microsoft.com (Secondary)
Description
Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized attacker to elevate privileges locally.
Affected (15)
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| Before 10.0.14393.8783 | |
| Before 10.0.17763.8276 | |
| Before 10.0.19044.6809 | |
| Before 10.0.19045.6809 | |
| Before 10.0.22631.6491 | |
| Before 10.0.26100.7623 | |
| Before 10.0.26200.7623 | |
| Version r2 | |
| Before 10.0.14393.8783 | |
| Before 10.0.17763.8276 | |
| Before 10.0.20348.4648 | |
| Before 10.0.25398.2092 | |
| Before 10.0.26100.32230 |
Related CWEs
CWE-122
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().
CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition
The product 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 product to perform invalid actions when the resource is in an unexpected state.
References (1)
Source: secure@microsoft.com
Vendor Advisory
Timeline
No history available yet.