CVE-2026-40397
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Severity Score
7.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track*
*SSVC
Descriptions
Integer underflow (wrap or wraparound) in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track*
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2026-04-13 CVE Reserved
- 2026-05-12 CVE Published
- 2026-05-13 EPSS Updated
- 2026-05-15 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-191: Integer Underflow (Wrap or Wraparound)
CAPEC
References (1)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40397 | 2026-05-14 |
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Microsoft Search vendor "Microsoft" | Windows 10 1607 Search vendor "Microsoft" for product "Windows 10 1607" | < 10.0.14393.9140 Search vendor "Microsoft" for product "Windows 10 1607" and version " < 10.0.14393.9140" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 1607 Search vendor "Microsoft" for product "Windows 10 1607" | < 10.0.14393.9140 Search vendor "Microsoft" for product "Windows 10 1607" and version " < 10.0.14393.9140" | x86 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 1809 Search vendor "Microsoft" for product "Windows 10 1809" | < 10.0.17763.8755 Search vendor "Microsoft" for product "Windows 10 1809" and version " < 10.0.17763.8755" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 1809 Search vendor "Microsoft" for product "Windows 10 1809" | < 10.0.17763.8755 Search vendor "Microsoft" for product "Windows 10 1809" and version " < 10.0.17763.8755" | x86 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 21h2 Search vendor "Microsoft" for product "Windows 10 21h2" | < 10.0.19044.7291 Search vendor "Microsoft" for product "Windows 10 21h2" and version " < 10.0.19044.7291" | arm64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 21h2 Search vendor "Microsoft" for product "Windows 10 21h2" | < 10.0.19044.7291 Search vendor "Microsoft" for product "Windows 10 21h2" and version " < 10.0.19044.7291" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 21h2 Search vendor "Microsoft" for product "Windows 10 21h2" | < 10.0.19044.7291 Search vendor "Microsoft" for product "Windows 10 21h2" and version " < 10.0.19044.7291" | x86 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 22h2 Search vendor "Microsoft" for product "Windows 10 22h2" | < 10.0.19045.7291 Search vendor "Microsoft" for product "Windows 10 22h2" and version " < 10.0.19045.7291" | arm64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 22h2 Search vendor "Microsoft" for product "Windows 10 22h2" | < 10.0.19045.7291 Search vendor "Microsoft" for product "Windows 10 22h2" and version " < 10.0.19045.7291" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 10 22h2 Search vendor "Microsoft" for product "Windows 10 22h2" | < 10.0.19045.7291 Search vendor "Microsoft" for product "Windows 10 22h2" and version " < 10.0.19045.7291" | x86 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 23h2 Search vendor "Microsoft" for product "Windows 11 23h2" | < 10.0.22631.7079 Search vendor "Microsoft" for product "Windows 11 23h2" and version " < 10.0.22631.7079" | arm64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 23h2 Search vendor "Microsoft" for product "Windows 11 23h2" | < 10.0.22631.7079 Search vendor "Microsoft" for product "Windows 11 23h2" and version " < 10.0.22631.7079" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 24h2 Search vendor "Microsoft" for product "Windows 11 24h2" | < 10.0.26100.8390 Search vendor "Microsoft" for product "Windows 11 24h2" and version " < 10.0.26100.8390" | arm64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 24h2 Search vendor "Microsoft" for product "Windows 11 24h2" | < 10.0.26100.8390 Search vendor "Microsoft" for product "Windows 11 24h2" and version " < 10.0.26100.8390" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 25h2 Search vendor "Microsoft" for product "Windows 11 25h2" | < 10.0.26200.8390 Search vendor "Microsoft" for product "Windows 11 25h2" and version " < 10.0.26200.8390" | arm64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 25h2 Search vendor "Microsoft" for product "Windows 11 25h2" | < 10.0.26200.8390 Search vendor "Microsoft" for product "Windows 11 25h2" and version " < 10.0.26200.8390" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 26h1 Search vendor "Microsoft" for product "Windows 11 26h1" | < 10.0.28000.2113 Search vendor "Microsoft" for product "Windows 11 26h1" and version " < 10.0.28000.2113" | arm64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows 11 26h1 Search vendor "Microsoft" for product "Windows 11 26h1" | < 10.0.28000.2113 Search vendor "Microsoft" for product "Windows 11 26h1" and version " < 10.0.28000.2113" | x64 |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2012 Search vendor "Microsoft" for product "Windows Server 2012" | - | - |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2012 Search vendor "Microsoft" for product "Windows Server 2012" | r2 Search vendor "Microsoft" for product "Windows Server 2012" and version "r2" | - |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2016 Search vendor "Microsoft" for product "Windows Server 2016" | < 10.0.14393.9140 Search vendor "Microsoft" for product "Windows Server 2016" and version " < 10.0.14393.9140" | - |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2019 Search vendor "Microsoft" for product "Windows Server 2019" | < 10.0.17763.8755 Search vendor "Microsoft" for product "Windows Server 2019" and version " < 10.0.17763.8755" | - |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2022 Search vendor "Microsoft" for product "Windows Server 2022" | < 10.0.20348.5074 Search vendor "Microsoft" for product "Windows Server 2022" and version " < 10.0.20348.5074" | - |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2022 23h2 Search vendor "Microsoft" for product "Windows Server 2022 23h2" | < 10.0.25398.2330 Search vendor "Microsoft" for product "Windows Server 2022 23h2" and version " < 10.0.25398.2330" | - |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Windows Server 2025 Search vendor "Microsoft" for product "Windows Server 2025" | < 10.0.26100.32772 Search vendor "Microsoft" for product "Windows Server 2025" and version " < 10.0.26100.32772" | - |
Affected
| ||||||