CVE-2025-39882
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's MediaTek DRM driver. The bug occurs when the driver incorrectly manages reference counts for device tree nodes, potentially allowing attackers to cause memory corruption. This affects Linux systems using MediaTek graphics hardware.
💻 Affected Systems
- Linux kernel with MediaTek DRM 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 panic, system crash, or potential privilege escalation to kernel-level code execution leading to complete system compromise.
Likely Case
System instability, crashes, or denial of service affecting graphical functionality.
If Mitigated
Limited impact with proper kernel hardening and exploit mitigations in place.
🎯 Exploit Status
Exploitation requires local access and specific conditions to trigger the use-after-free condition.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits 4de37a48b6b58faaded9eb765047cf0d8785ea18, b2fbe0f9f80b9cfa1e06ddcf8b863d918394ef1d, b58a26cdd4795c1ce6a80e38e9348885555dacd6, or c4901802ed1ce859242e10af06e6a7752cba0497
Vendor Advisory: https://git.kernel.org/stable/c/4de37a48b6b58faaded9eb765047cf0d8785ea18
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Reboot system. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable MediaTek DRM module
linuxPrevent loading of the vulnerable kernel module if not required
echo 'blacklist mediatek-drm' >> /etc/modprobe.d/blacklist.conf
rmmod mediatek-drm
🧯 If You Can't Patch
- Restrict local user access to systems with vulnerable kernel
- Implement kernel hardening features like KASLR and SMEP/SMAP
🔍 How to Verify
Check if Vulnerable:
Check if MediaTek DRM module is loaded: lsmod | grep mediatek-drm AND check kernel version against affected rangesCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes one of the fix commits: uname -r AND check git log for commit hashes📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes related to DRM/GPU
- Memory corruption warnings in dmesg
Network Indicators:
- None - local vulnerability
SIEM Query:
Search for: 'kernel: BUG:', 'kernel: general protection fault', 'drm' AND 'panic'