CVE-2025-54637
📋 TL;DR
This CVE describes an out-of-bounds array access vulnerability in the kernel ambient light module due to insufficient data verification. Successful exploitation could allow unauthorized access to sensitive information, affecting service confidentiality. This primarily affects Huawei devices with vulnerable kernel versions.
💻 Affected Systems
- Huawei devices with vulnerable kernel ambient light module
📦 What is this software?
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
An attacker could read kernel memory beyond the allocated buffer, potentially accessing sensitive system information or credentials stored in adjacent memory regions.
Likely Case
Information disclosure of limited kernel memory contents, possibly revealing system state information or partial memory dumps.
If Mitigated
With proper kernel hardening and memory protection mechanisms, exploitation would be limited to reading non-sensitive memory regions or cause system instability.
🎯 Exploit Status
Exploitation requires local access and ability to interact with the kernel ambient light module interface; CVSS 4.4 indicates moderate complexity
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security bulletin for specific patched versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2025/8/
Restart Required: No
Instructions:
1. Check Huawei security advisory for affected device models and versions. 2. Apply the latest security update from Huawei. 3. Verify kernel version after update. 4. No reboot required for kernel module updates in most cases.
🔧 Temporary Workarounds
Disable ambient light module
Android/LinuxRemove or disable the vulnerable kernel module if not required
rmmod ambient_light_module
echo 'blacklist ambient_light_module' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local users from interacting with kernel interfaces
- Enable kernel hardening features like KASLR and memory protection to limit impact of memory disclosure
🔍 How to Verify
Check if Vulnerable:
Check kernel version and module loading: 'lsmod | grep ambient_light' and compare version against Huawei advisoryCheck Version:
uname -rVerify Fix Applied:
Verify kernel version after update and ensure ambient light module is either updated or disabled📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Out-of-bounds memory access warnings in dmesg
- Unusual ambient light sensor activity
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="kernel" AND ("out of bounds" OR "OOB" OR "ambient_light")