CVE-2025-39837
📋 TL;DR
A race condition vulnerability in the ASUS WMI driver for Linux kernel allows concurrent driver registrations to corrupt memory, potentially causing kernel crashes or system instability. This affects Linux systems running on ASUS hardware with the vulnerable driver loaded. Attackers could exploit this to cause denial of service or potentially execute arbitrary code.
💻 Affected Systems
- Linux kernel ASUS WMI driver
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory corruption leading to system crash, privilege escalation, or arbitrary code execution at kernel level.
Likely Case
System instability, kernel panics, or denial of service on affected ASUS machines when multiple drivers attempt concurrent registration.
If Mitigated
Minimal impact if proper kernel hardening and access controls are in place, though system instability may still occur.
🎯 Exploit Status
Exploitation requires ability to trigger concurrent driver registrations, which typically requires local access or ability to load kernel modules.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 5549202b9c02c2ecbc8634768a3da8d9e82d548d and e7a70326fb26b905cfc8fe2366113aa4394733ef
Vendor Advisory: https://git.kernel.org/stable/c/5549202b9c02c2ecbc8634768a3da8d9e82d548d
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel. 3. Reboot system to load patched kernel.
🔧 Temporary Workarounds
Disable ASUS WMI driver
linuxPrevent loading of the vulnerable driver module
echo 'blacklist asus-wmi' >> /etc/modprobe.d/blacklist.conf
rmmod asus-wmi
Restrict module loading
linuxPrevent unauthorized kernel module loading
echo 'kernel.modules_disabled=1' >> /etc/sysctl.conf
sysctl -p
🧯 If You Can't Patch
- Restrict physical and remote access to affected systems
- Implement strict privilege separation and limit user ability to load kernel modules
🔍 How to Verify
Check if Vulnerable:
Check if ASUS WMI driver is loaded: lsmod | grep asus_wmi. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits: uname -r. Check if driver loads without issues.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- OOM killer activity
- Driver registration failures in dmesg
- System instability/crash logs
Network Indicators:
- None - local vulnerability
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "BUG") AND "asus"