CVE-2025-39820
📋 TL;DR
A NULL pointer dereference vulnerability in the Linux kernel's DRM/MSM DPU driver could cause kernel panics or system crashes when specific graphics operations are performed. This affects Linux systems using Qualcomm Adreno/DPU graphics hardware with unpatched kernels. The vulnerability requires local access or ability to trigger graphics operations.
💻 Affected Systems
- Linux kernel with DRM/MSM DPU 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, potentially causing data loss or service disruption.
Likely Case
System crash or instability when users perform specific graphics operations, requiring reboot to restore functionality.
If Mitigated
Minor performance impact or failed graphics operation without system crash if error handling catches the issue.
🎯 Exploit Status
Requires ability to trigger specific DRM atomic operations through graphics API calls or privileged access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits aaec54254b02f5959c3670177037464d828b2140 and abebfed208515726760d79cf4f9f1a76b9a10a84
Vendor Advisory: https://patchwork.freedesktop.org/patch/665188/
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For custom kernels: Apply the patch from patchwork.freedesktop.org. 3. Rebuild and install the kernel. 4. No reboot required for live kernel updates if using kpatch or similar.
🔧 Temporary Workarounds
Disable DPU driver module
LinuxPrevent loading of the vulnerable DRM/MSM DPU driver module
echo 'blacklist msm' >> /etc/modprobe.d/blacklist-msm.conf
rmmod msm
🧯 If You Can't Patch
- Restrict user access to graphics operations and DRM interfaces
- Implement monitoring for kernel panic events and system crashes
🔍 How to Verify
Check if Vulnerable:
Check if kernel contains the vulnerable code: grep -r 'drm_atomic_get_new_connector_state' /usr/src/linux/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.cCheck Version:
uname -rVerify Fix Applied:
Verify the patch is applied: grep -A2 -B2 'if (!conn_state)' /usr/src/linux/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- NULL pointer dereference errors in kernel logs
- System crash/reboot events
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("NULL pointer dereference" OR "kernel panic" OR "Oops") AND process="drm/msm"