CVE-2026-24917: Huawei EMUI Use-After-Free Vulnerability

CVE-2026-24917 Overview

CVE-2026-24917 is a Use After Free (UAF) vulnerability affecting the security module in Huawei EMUI and HarmonyOS operating systems. This memory corruption flaw occurs when the security module references memory after it has been freed, potentially leading to system instability and denial of service conditions on affected mobile devices.

Critical Impact

Successful exploitation of this vulnerability may cause system crashes and service disruption on Huawei mobile devices running vulnerable versions of EMUI and HarmonyOS.

Affected Products

• Huawei EMUI versions 13.0.0, 14.0.0, 14.2.0, and 15.0.0
• Huawei HarmonyOS versions 3.1.0, 4.0.0, 4.2.0, and 4.3.0
• Huawei mobile devices running affected operating system versions

Discovery Timeline

• 2026-02-06 - CVE-2026-24917 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-24917

Vulnerability Analysis

This Use After Free vulnerability (CWE-416) resides within the security module of Huawei's mobile operating systems. UAF vulnerabilities occur when a program continues to use a pointer after the memory it references has been deallocated. In this case, the security module improperly handles memory management, allowing subsequent operations to reference freed memory regions.

The vulnerability requires local access to exploit, meaning an attacker would need either physical access to the device or the ability to execute code through a malicious application. While the primary impact is on system availability rather than data confidentiality or integrity, successful exploitation could cause the security module to crash, potentially disrupting device security functions and causing denial of service conditions.

Root Cause

The root cause of CVE-2026-24917 lies in improper memory lifecycle management within the security module. When memory objects are freed, references to these objects are not properly invalidated, allowing the security module to subsequently access invalid memory locations. This programming error in memory handling creates a race condition where freed memory may be reallocated for other purposes before the dangling pointer is dereferenced.

Attack Vector

The attack vector for this vulnerability is local, requiring an attacker to have either direct access to the device or the ability to execute malicious code through an installed application. The exploitation path involves:

1. Triggering the vulnerable code path in the security module that improperly handles memory deallocation
2. Causing the security module to reference the freed memory region
3. Exploiting the resulting memory corruption to cause a crash or denial of service

The vulnerability does not require user interaction once malicious code is executing on the device. While the current assessment indicates the primary impact is availability-focused, UAF vulnerabilities can sometimes be chained with other techniques for more severe attacks.

Detection Methods for CVE-2026-24917

Indicators of Compromise

• Unexpected security module crashes or restarts on Huawei devices
• System logs indicating memory access violations in security-related processes
• Repeated application crashes when interacting with security functions
• Unusual system instability following installation of untrusted applications

Detection Strategies

• Monitor system logs for kernel panic events or security module crash reports
• Implement application vetting to prevent installation of potentially malicious apps that could trigger the vulnerability
• Deploy endpoint detection solutions capable of identifying anomalous memory access patterns
• Review device crash reports for patterns consistent with UAF exploitation attempts

Monitoring Recommendations

• Enable enhanced logging on enterprise-managed Huawei devices to capture security module events
• Configure mobile device management (MDM) solutions to alert on repeated system crashes
• Monitor for applications requesting unusual permissions that could facilitate local exploitation
• Establish baseline device behavior to detect anomalies indicative of exploitation attempts

How to Mitigate CVE-2026-24917

Immediate Actions Required

• Update affected Huawei devices to the latest firmware version containing the security patch
• Review installed applications and remove any untrusted or suspicious software
• Enable automatic security updates on all Huawei devices running EMUI or HarmonyOS
• Restrict installation of applications from unknown sources on enterprise-managed devices

Patch Information

Huawei has addressed this vulnerability in their February 2026 security bulletin. Device owners should check for and install the latest system updates through the device's Settings menu. Enterprise administrators should prioritize deployment of this patch across managed Huawei device fleets.

For detailed patch information and affected version specifics, refer to the Huawei Security Bulletin.

Workarounds

• Limit application installations to trusted sources such as the official Huawei AppGallery
• Implement strict application whitelisting policies on enterprise-managed devices
• Avoid granting unnecessary permissions to installed applications
• Consider network-level controls to prevent potentially malicious applications from communicating with external servers

# Verify current EMUI/HarmonyOS version on device
# Navigate to: Settings > About phone > Build number
# Ensure the security patch level is February 2026 or later

# For enterprise MDM administrators:
# Configure policy to enforce minimum OS security patch level
# minimum_security_patch_level="2026-02-01"