CVE-2025-21098
📋 TL;DR
This vulnerability in OpenHarmony allows a local attacker to bypass permission checks and perform out-of-bounds reads, potentially leaking sensitive information from kernel memory. It affects OpenHarmony v5.0.2 and earlier versions, impacting devices running these operating system versions.
💻 Affected Systems
- OpenHarmony
📦 What is this software?
Openharmony by Openatom
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could read kernel memory containing sensitive data like encryption keys, passwords, or other process memory, potentially leading to privilege escalation or further system compromise.
Likely Case
Local information disclosure where an attacker can read portions of kernel memory, potentially exposing system information or data from other processes.
If Mitigated
Limited information exposure with proper access controls and isolation mechanisms in place.
🎯 Exploit Status
Requires local access and knowledge of the vulnerability. The permission bypass aspect suggests it may be easier to exploit than typical out-of-bounds read vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: OpenHarmony v5.0.3 or later
Vendor Advisory: https://gitee.com/openharmony/security/blob/master/zh/security-disclosure/2025/2025-03.md
Restart Required: Yes
Instructions:
1. Check current OpenHarmony version. 2. Update to OpenHarmony v5.0.3 or later. 3. Reboot the device to apply the kernel patch.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and local user access to vulnerable devices
Enable SELinux/AppArmor
linuxIf supported, enable mandatory access controls to limit damage from successful exploitation
🧯 If You Can't Patch
- Isolate vulnerable devices on separate network segments
- Implement strict access controls and monitoring for local user activities
🔍 How to Verify
Check if Vulnerable:
Check OpenHarmony version: cat /etc/os-release or uname -aCheck Version:
cat /etc/os-release | grep VERSION or uname -rVerify Fix Applied:
Verify version is v5.0.3 or later and check for security patch updates📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Permission denied errors for unexpected processes
- Unusual memory access patterns in system logs
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
source="kernel" AND ("out of bounds" OR "segmentation fault" OR "general protection fault")