Privilege escalation via untrusted kernel callback
Published Aug 11, 2026 · Updated Aug 25, 2026
Untrusted pointer dereference in Windows Kernel in Microsoft Windows 11 and Windows Server 2025 allows local users to gain SYSTEM privileges. Public exploit material ties the bug to ExecutionContext.sys, where a low user can queue an ExecutionContext task whose Callback pointer is later invoked in kernel context, turning untrusted callback state into a controlled kernel control transfer. Exploitation is local and requires an existing low-privilege foothold; Microsoft lists affected builds before 10.0.26100.9168, 10.0.26200.9168, 10.0.28000.2704, and 10.0.26100.33296.
Summary
What happened
Untrusted pointer dereference in Windows Kernel in Microsoft Windows 11 and Windows Server 2025 allows local users to gain SYSTEM privileges. Public exploit material ties the bug to ExecutionContext.sys, where a low user can queue an ExecutionContext task whose Callback pointer is later invoked in kernel context, turning untrusted callback state into a controlled kernel control transfer. Exploitation is local and requires an existing low-privilege foothold; Microsoft lists affected builds before 10.0.26100.9168, 10.0.26200.9168, 10.0.28000.2704, and 10.0.26100.33296.
The record
- CVE
- CVE-2026-62737
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-822, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- cve-2026-62737-labproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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