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CVE-2026-48583 is a use-after-free (UAF) vulnerability in the Windows Kernel that allows a local, low-privileged attacker to elevate their privileges to the SYSTEM level, which is the highest level of access on a Windows machine. The flaw resides in how the kernel manages memory objects during specific operations; after an object is freed, the kernel continues to hold a dangling pointer to the now-invalid memory location. This creates a small window of opportunity for an attacker to manipulate memory allocation. By racing to reallocate the freed memory with attacker-controlled data, they can overwrite critical kernel structures. Exploiting this condition allows the attacker to execute arbitrary code in kernel mode, effectively taking complete control of the system. The vulnerability requires local access, meaning the attacker must already have code execution on the target machine, typically obtained through a phishing attack, compromised application, or other initial foothold. It is frequently chained with another exploit that provides that initial remote code execution. It is classified as CWE-416 and was announced by Microsoft on June 9, 2026, as part of the Patch Tuesday updates.
DailyCVE Form:
Platform: Windows Kernel
Version: 10/11, Server
Vulnerability : Use-After-Free
Severity: High (CVSS 7.8)
date: June 9, 2026
Prediction: June Patch Tuesday
What Undercode Say:
To check for this specific vulnerability, an administrator can use a PowerShell script to query the system for the relevant security update.
Check for the June 2026 Security Update
Get-HotFix | Where-Object {$_.InstalledOn -gt "2026-06-01"}
Example: Check for a potentially vulnerable driver via the command line driverquery /v | findstr /i "kernel"
Exploit:
A successful exploit would chain the UAF to overwrite a function pointer in a kernel object. When the kernel later calls the corrupted function, execution flow is redirected to the attacker’s shellcode, which is typically mapped to a user-mode address but executed with kernel privileges. While no public exploit is available, proof-of-concept code is expected to be developed after analysis of the patch.
Protection:
Apply the official security update from Microsoft, which is the only complete mitigation. Until patching is possible, enforce the principle of least privilege for local users and restrict the execution of untrusted code. Use Endpoint Detection and Response (EDR) solutions to monitor for anomalous behavior indicative of privilege escalation.
Impact:
Successful exploitation results in complete system compromise, granting the attacker SYSTEM-level privileges. This allows them to disable security software, read protected memory, tamper with system logs, install persistent backdoors, and dump credentials from the Local Security Authority (LSA).
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Sources:
Reported By: nvd.nist.gov
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