CVE-2025-39712
📋 TL;DR
A deadlock vulnerability in the Linux kernel's mt9m114 camera sensor driver causes system hangs when frame interval operations are performed. This affects Linux systems using the mt9m114 camera sensor driver, potentially impacting embedded devices, IoT cameras, and systems with this specific hardware.
💻 Affected Systems
- Linux kernel with mt9m114 camera sensor 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 →⚠️ Risk & Real-World Impact
Worst Case
Complete system deadlock requiring hard reboot, causing denial of service and potential data loss in critical systems.
Likely Case
System hangs or freezes when camera frame interval operations are attempted, requiring manual intervention to restore functionality.
If Mitigated
Minor performance impact or failed camera operations without system-wide disruption.
🎯 Exploit Status
Exploitation requires access to camera hardware and ability to trigger specific V4L2 operations. Not remotely exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 0d23b548d71e5d76955fdf1d73addd8f6494f602, 298d1471cf83d5a2a05970e41822a2403f451086, or 41b97490a1656bdc7038d6345a84b08d45deafc6
Vendor Advisory: https://git.kernel.org/stable/c/0d23b548d71e5d76955fdf1d73addd8f6494f602
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For embedded systems: Rebuild kernel with patched driver. 3. For distributions: Apply security updates from your vendor. 4. No kernel reboot required if using module unloading/reloading.
🔧 Temporary Workarounds
Disable mt9m114 driver
allPrevent loading of the vulnerable driver if camera functionality is not required
echo 'blacklist mt9m114' >> /etc/modprobe.d/blacklist.conf
rmmod mt9m114
Avoid frame interval operations
allPrevent applications from calling get_frame_interval/set_frame_interval on mt9m114 devices
🧯 If You Can't Patch
- Monitor system for hangs and implement automatic recovery mechanisms
- Isolate affected systems from critical infrastructure
🔍 How to Verify
Check if Vulnerable:
Check if mt9m114 driver is loaded: lsmod | grep mt9m114. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel includes fix commits: git log --oneline | grep -E '0d23b548d71e|298d1471cf83|41b97490a165'. Test camera frame interval operations.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- System hang/freeze events
- Camera driver timeout errors in dmesg
Network Indicators:
- None - local hardware vulnerability
SIEM Query:
source="kernel" AND ("mt9m114" OR "deadlock" OR "frame_interval")