CVE-2025-38021
📋 TL;DR
A null pointer dereference vulnerability in the Linux kernel's AMD display driver could cause kernel crashes or system instability. This affects Linux systems with AMD graphics hardware using the affected kernel versions. The vulnerability occurs when the display driver fails to properly validate a pointer before dereferencing it.
💻 Affected Systems
- Linux kernel with AMD display driver (drm/amd/display)
📦 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 →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 system instability.
Likely Case
System crash or instability when specific display operations are performed, requiring reboot to restore functionality.
If Mitigated
Minimal impact with proper access controls and monitoring in place, as exploitation requires local access.
🎯 Exploit Status
Exploitation requires local access and specific conditions to trigger the null pointer dereference.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 4679061fb25344d6010ce7b9bebac21c91a0b75a and a3b7e65b6be59e686e163fa1ceb0922f996897c2
Vendor Advisory: https://git.kernel.org/stable/c/4679061fb25344d6010ce7b9bebac21c91a0b75a
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable affected display features
linuxAvoid using specific display configurations that trigger the vulnerable code path
🧯 If You Can't Patch
- Restrict local user access to systems with AMD graphics
- Implement monitoring for kernel crashes and system instability
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if it contains the vulnerable commits. Use 'uname -r' and compare with affected versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits. Check /proc/version or use distribution package manager to verify kernel package version.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- System crash reports
- Display driver error messages
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Search for kernel panic events or system crash reports in system logs