CVE-2026-40407: Windows Common Log File System Driver Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Other sources
Windows Common Log File System Driver Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 10.0.14393.9140Patch KB5087537 - Upgrade
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Fixed in 6.3.9600.23181Patch KB5087471 - Upgrade
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Fixed in 6.2.9200.26079Patch KB5087470 - Upgrade
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Fixed in 10.0.28000.2113Patch KB5089548 - Upgrade
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Fixed in 10.0.26100.8457Fixed in 10.0.26100.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.25398.2330Patch KB5087541 - Upgrade
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Fixed in 10.0.26100.32860Fixed in 10.0.26100.32772Patch KB5087423 - Upgrade
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Fixed in 10.0.22631.7079Patch KB5087420 - Upgrade
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Fixed in 10.0.19045.7417Patch KB5094127 - Upgrade
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Fixed in 10.0.19044.7291Patch KB5087544 - Upgrade
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Fixed in 10.0.17763.8755Patch KB5087538 - Upgrade
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Fixed in 10.0.26200.8457Fixed in 10.0.26200.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.20348.5139Fixed in 10.0.20348.5074Patch KB5087424 - Upgrade
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Fixed in 10.0.22631.7219Patch KB5093998
Event History
Frequently Asked Questions
What is the severity of CVE-2026-40407?
CVE-2026-40407 has a critical severity rating due to the potential for local privilege escalation when exploited.
How do I fix CVE-2026-40407?
To mitigate CVE-2026-40407, apply the security patches provided by Microsoft for the affected versions of Windows.
Which systems are affected by CVE-2026-40407?
CVE-2026-40407 affects various versions of Windows, including Windows 10 and Windows Server 2016 and later.
Can CVE-2026-40407 be exploited remotely?
No, CVE-2026-40407 requires local access to the system, limiting its exploitation potential.
What are the potential consequences of CVE-2026-40407 if exploited?
Exploitation of CVE-2026-40407 can allow an authorized user to elevate their privileges, potentially leading to unauthorized access or control over the system.