CVE-2025-38421
📋 TL;DR
A double-free vulnerability in the AMD Platform Management Framework (PMF) driver in the Linux kernel could lead to memory corruption and potential kernel panic or privilege escalation. This affects Linux systems with AMD processors that use the amd-pmf driver. Attackers with local access could exploit this to crash the system or potentially execute arbitrary code.
💻 Affected Systems
- Linux kernel with AMD Platform Management Framework 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 →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
Local privilege escalation leading to full system compromise, kernel panic causing denial of service, or arbitrary code execution at kernel level.
Likely Case
Kernel panic leading to system crash and denial of service when malicious users trigger the double-free condition.
If Mitigated
Minimal impact with proper access controls limiting local user privileges and kernel hardening features enabled.
🎯 Exploit Status
Requires local access and ability to trigger the smart PC setup failure condition. Exploitation would require understanding of kernel memory management.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 0d10b532f861253c283863522d59d099fcb0796d and d9db3a941270d92bbd1a6a6b54a10324484f2f2d applied
Vendor Advisory: https://git.kernel.org/stable/c/0d10b532f861253c283863522d59d099fcb0796d
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check with your distribution vendor for patched kernel packages. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable amd-pmf module
linuxPrevent loading of the vulnerable driver module
echo 'blacklist amd_pmf' >> /etc/modprobe.d/blacklist-amd-pmf.conf
update-initramfs -u
reboot
Restrict local user access
allLimit non-privileged user access to systems
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Enable kernel hardening features like KASLR and stack protection
🔍 How to Verify
Check if Vulnerable:
Check if amd-pmf module is loaded: lsmod | grep amd_pmf. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits or check with vendor for patched kernel version.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- OOM killer activity
- System crash/reboot logs
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "BUG") AND "amd_pmf"