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How CVE-2026-58526 Works
CVE-2026-58526 is a use-after-free (UAF) vulnerability in the Windows Storage component that allows a locally authenticated attacker to elevate privileges to SYSTEM level. The flaw stems from improper memory management when Windows Storage handles concurrent access to shared resources, creating a race condition that can be exploited to reference freed memory.
Under normal operation, Windows Storage allocates memory for objects used during storage operations and frees that memory when no longer needed. However, due to a synchronization error (CWE-362), multiple threads may access the same object simultaneously. If one thread frees the object while another thread still holds a reference to it, the second thread will attempt to use memory that has already been deallocated. This use-after-free condition can be triggered by an attacker who manipulates the timing of storage operations, causing the system to access a stale pointer.
Successful exploitation allows the attacker to overwrite the freed memory with controlled data, leading to arbitrary code execution in the kernel context. Because the vulnerability resides in the Windows Storage stack, it is reachable from user mode through legitimate API calls, making it a viable vector for privilege escalation.
The attack vector is local (AV:L), requiring the attacker to already have low-privileged access to the target system (PR:L). The attack complexity is rated high (AC:H) because the race condition must be won reliably, which may require precise timing or repeated attempts. No user interaction is needed (UI:N), and the scope is unchanged (S:U). The impact on confidentiality, integrity, and availability is rated high (C:H/I:H/A:H), meaning a successful attacker can read sensitive data, modify system files, and disrupt operations.
Microsoft assigned a CVSS 3.1 base score of 7.0 (High). The vulnerability affects Windows 10, Windows 11, and Windows Server from 2019 through 2025, including both x64 and ARM64 architectures. There is no evidence of public disclosure or active exploitation prior to the July 2026 patch release. The patch was included in the cumulative updates released on July 14, 2026, and all affected systems should be updated immediately.
DailyCVE Form:
Platform: ……. Windows
Version: …….. 10/11/Server 2019-2025
Vulnerability :.. Use-After-Free (CWE-416)
Severity: ……. High (CVSS 7.0)
date: ……….. 2026-07-14
Prediction: ….. Patch already released (Jul 14, 2026)
What Undercode Say
Analytics:
- CTI Interest Score: Moderate – no public exploits observed.
- Exploit Price Estimate: $25,000 – $100,000 (as of July 14, 2026).
- Exploit Availability: None public; not readily automatable per CISA.
- Attack Surface: Local only, requires authenticated user.
- Patch Adoption: Expected high due to criticality.
Bash Commands & Codes (Check Patch Status):
Check Windows version and build number
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"
Verify installed updates (look for KB5099538, KB5099539, KB5101650, KB5099540)
wmic qfe list brief | findstr "KB5099538 KB5099539 KB5101650 KB5099540"
Alternative using PowerShell
Get-HotFix | Where-Object { $_.HotFixID -match "KB5099538|KB5099539|KB5101650|KB5099540" }
Check build number for Windows 11 24H2 (should be >= 26100.8875)
Exploit:
No public exploit is available. Theoretical exploitation involves:
- Gaining local low-privileged access (e.g., via phishing or malware).
- Triggering concurrent storage operations to induce a race condition.
- Spraying the heap with controlled data to replace the freed object.
- Corrupting kernel memory to execute shellcode and spawn a SYSTEM shell.
Protection:
- Immediate: Install the July 14, 2026 cumulative updates (KB5099538, KB5099539, KB5101650, KB5099540).
- Mitigation: Restrict local logon rights; enforce least privilege; use endpoint detection and response (EDR) to monitor for abnormal storage API calls.
- Workaround: None officially provided; patching is the only complete solution.
Impact:
- Confidentiality: Attacker can read protected system files and user data.
- Integrity: Attacker can modify system binaries, registry, and configuration.
- Availability: Attacker can crash the system or cause denial of service.
- Privilege Escalation: Full SYSTEM-level control, enabling persistence, lateral movement, and further attacks.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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