CVE-2026-62774 Overview
CVE-2026-62774 is a use-after-free vulnerability [CWE-416] in the Windows Graphics Kernel component. An authenticated local attacker can exploit the flaw to elevate privileges on affected Windows client and server systems. The issue impacts multiple supported releases of Windows 10, Windows 11, and Windows Server, indicating a shared code path in the graphics kernel subsystem. Successful exploitation grants attackers high impact on confidentiality, integrity, and availability of the compromised host.
Critical Impact
Successful exploitation allows a low-privileged local user to gain elevated privileges on the affected Windows host, enabling kernel-level code execution and full system compromise.
Affected Products
- Microsoft Windows 10 (1607, 1809, 21H2, 22H2) on x86, x64, and ARM64
- Microsoft Windows 11 (23H2, 24H2, 25H2, 26H1) on x64 and ARM64
- Microsoft Windows Server 2016, 2019, 2022, and 2025
Discovery Timeline
- 2026-08-11 - CVE-2026-62774 published to NVD
- 2026-08-13 - Last updated in NVD database
Technical Details for CVE-2026-62774
Vulnerability Analysis
The vulnerability is a use-after-free condition [CWE-416] within the Windows Graphics Kernel. This class of flaw occurs when code continues to reference kernel memory after it has been freed, allowing an attacker to influence the contents of the reclaimed allocation. In kernel-mode graphics components, such flaws typically enable attackers to corrupt kernel object metadata and pivot to arbitrary read/write primitives.
Exploitation requires local access and low privileges, meaning the attacker must already run code on the target as a standard user. The advisory notes high attack complexity, suggesting that reliable exploitation depends on winning a race or manipulating specific object lifetimes. Once the freed object is reused with attacker-controlled data, the attacker can escalate to SYSTEM.
Root Cause
The root cause is improper object lifetime management in the Graphics Kernel. A kernel object referenced by a graphics operation is freed while another code path still holds a stale pointer to it. Subsequent dereference of that pointer operates on attacker-influenced memory. Microsoft has not published the specific function or object type in the public advisory.
Attack Vector
The attack vector is local. An authorized user runs a crafted user-mode program that issues graphics-related system calls or GDI/DirectX operations in a sequence designed to trigger the freed-object reuse. No user interaction from another account is required. Because the flaw resides in kernel graphics code, successful exploitation results in privilege escalation from a standard user account to SYSTEM.
No public proof-of-concept code or verified exploit is available at the time of publication. Refer to the Microsoft Security Advisory CVE-2026-62774 for vendor technical guidance.
Detection Methods for CVE-2026-62774
Indicators of Compromise
- Unexpected process token elevation on a standard user session, particularly a non-administrative process suddenly running as NT AUTHORITY\SYSTEM.
- Kernel bugchecks referencing the graphics kernel driver (dxgkrnl.sys or related components) following execution of untrusted binaries.
- Newly spawned child processes with SYSTEM integrity level parented by an interactive user process.
Detection Strategies
- Monitor for local privilege escalation behaviors: token duplication, SeDebugPrivilege acquisition, and unexpected access to protected processes from user-context binaries.
- Alert on user-mode processes issuing anomalous volumes of graphics kernel syscalls or GDI object allocations followed by process crashes.
- Correlate Windows Error Reporting entries and kernel crash dumps referencing graphics subsystem faults with recent execution of unsigned or newly introduced binaries.
Monitoring Recommendations
- Enable kernel-mode crash dump collection on endpoints and forward reports to a central log store for triage.
- Track Sysmon Event ID 1 (process creation) and Event ID 10 (process access) for suspicious parent-child chains ending in SYSTEM processes.
- Baseline expected graphics driver behavior and alert on outliers, especially on servers where interactive graphics workloads are uncommon.
How to Mitigate CVE-2026-62774
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft Security Advisory CVE-2026-62774 to all affected Windows client and server systems.
- Prioritize patching multi-user systems, Remote Desktop Session Hosts, VDI infrastructure, and Windows Servers exposed to interactive logon.
- Restrict local logon and code execution rights for standard users where operationally feasible, reducing the attacker population that can trigger the flaw.
Patch Information
Microsoft has released security updates for all affected Windows 10, Windows 11, and Windows Server versions. Consult the Microsoft Security Advisory CVE-2026-62774 for the specific KB numbers and cumulative update packages that address the flaw on each supported build.
Workarounds
- No official workarounds have been published by Microsoft; installing the security update is the supported remediation path.
- Enforce application control policies such as Windows Defender Application Control or AppLocker to block unsigned or unknown binaries from running in user context.
- Apply the principle of least privilege and remove local administrator rights from standard user accounts to limit post-exploitation impact.
# Verify patch installation status on Windows using PowerShell
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 20
# Check current Windows build to confirm it matches a patched version
[System.Environment]::OSVersion.Version
(Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').DisplayVersion
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
