EUVD-2026-21829Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessLocal access to device
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DeliveryInteract with screen UI rapidly
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ExploitTrigger race condition in resource manager
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ExecutionDereference freed memory
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PersistApplication crash
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ImpactDenial of service
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V15 - Secure Coding and Architecture Concurrency control, locking
MITRE ATT&CK
1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | This vulnerability presents low real-world risk despite being classified as a CVE. The CVSS vector (AV:L/AC:H/PR:N/UI:R/S:U) indicates local attack vector, high attack complexity, and required user interaction-all factors that significantly reduce exploitability. EPSS data not provided, but the combination of CVSS 2.5, local-only access, high complexity, and user interaction requirement suggests exploitation probability is minimal. The impact is limited to availability (denial of service via race condition-triggered crash), with no confidentiality or integrity impact. KEV status unknown, but absence of public POC and low CVSS suggest this is not a prioritized exploitation target. This aligns with SSVC framework: exploitation requires specific timing/conditions (lower likelihood), technical impact is limited (availability only), and automatable exploitation is low due to race condition unpredictability. Resource prioritization should focus on higher-CVSS vulnerabilities; this warrants standard patching cycles rather than emergency response. |
| Exploit ScenarioDerived | A local attacker with physical or remote access to a HarmonyOS device interacts with screen management UI elements (such as brightness controls, screen rotation, or lock/unlock sequences) in rapid succession to create a race condition in the screen resource management module. If the timing aligns with freed memory dereferencing, the application crashes, causing denial of service. The attack requires precise timing and multiple attempts, making it unreliable but feasible on a targeted device. |
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Alert meAnalysisAIv1 – Apr 13, 2026
Use-after-free vulnerability in HarmonyOS screen management module allows local, unauthenticated attackers with user interaction to cause denial of service through a race condition. CVSS score of 2.5 reflects low severity with availability impact only; no confidentiality or integrity compromise. No public exploit code or active exploitation confirmed at time of analysis.
RemediationAI
Apply the security patch released by Huawei through the official security bulletin at https://consumer.huawei.com/en/support/bulletin/2026/4/. Users should check the bulletin for their specific device model to obtain the patched HarmonyOS version, as fix versions vary by device hardware platform. Enable automatic system updates to receive patches as released. Until patching is possible, minimize use of screen management features and close unnecessary applications to reduce likelihood of triggering the race condition during concurrent screen state transitions, though this is not a reliable workaround.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The vulnerability exists in HarmonyOS screen management module as a use-after-free (CWE-362: Concurrent Execution Using Shared Resource with Improper Synchronization) condition. UAF vulnerabilities occur when a program references memory that has been freed, typically due to improper synchronization between concurrent operations or inadequate lifecycle management. In this case, a race condition in screen resource management allows an attacker to access or manipulate freed memory objects. The attack requires local access and user interaction (triggering UI actions), making it a client-side vulnerability rather than a network-facing one. The race condition nature suggests the vulnerability manifests under specific timing windows during concurrent screen state transitions.
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Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionNVD
UAF vulnerability in the screen management module. Impact: Successful exploitation of this vulnerability may affect availability.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Race conditions occur when multiple concurrent requests exploit the brief time gap between checking a condition and acting upon it (TOCTOU - Time of Check, Time of Use).
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GitHub PoC
Exploit-DB