CVE-2023-52678
📋 TL;DR
This CVE addresses a NULL pointer dereference vulnerability in the AMD GPU kernel driver (amdkfd) of the Linux kernel. The issue occurs when the driver attempts to access elements from empty linked lists without proper validation, which could lead to kernel crashes or denial of service. Systems using AMD GPUs with the affected kernel driver are vulnerable.
💻 Affected Systems
- Linux kernel with AMD GPU driver (amdkfd)
📦 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 →⚠️ 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 instability or kernel crash requiring reboot, resulting in temporary service interruption.
If Mitigated
Minor performance impact from additional validation checks with no security impact when patched.
🎯 Exploit Status
Exploitation requires local access and ability to trigger specific GPU topology operations through the kernel driver.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 4525525cb7161d08f95d0e47025323dd10214313 or later
Vendor Advisory: https://git.kernel.org/stable/c/4525525cb7161d08f95d0e47025323dd10214313
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel package. 3. Reboot system to load patched kernel.
🔧 Temporary Workarounds
Disable AMD GPU driver
linuxPrevent loading of the vulnerable amdkfd driver module
echo 'blacklist amdkfd' >> /etc/modprobe.d/blacklist-amdkfd.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local user access to systems with AMD GPUs
- Implement strict privilege separation to limit who can access GPU operations
🔍 How to Verify
Check if Vulnerable:
Check if amdkfd module is loaded: lsmod | grep amdkfd AND check kernel version against patched versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits: grep -q '4525525cb7161d08f95d0e47025323dd10214313' /proc/version_signature (if available) OR check distribution kernel changelog📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- GPU driver crash logs
- System reboot events without clear cause
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kern.log" AND ("kernel panic" OR "Oops" OR "amdkfd")🔗 References
- https://git.kernel.org/stable/c/4525525cb7161d08f95d0e47025323dd10214313
- https://git.kernel.org/stable/c/499839eca34ad62d43025ec0b46b80e77065f6d8
- https://git.kernel.org/stable/c/4ac4e023ed7ab1c7c67d2d12b7b6198fcd099e5c
- https://git.kernel.org/stable/c/5024cce888e11e5688f77df81db9e14828495d64
- https://git.kernel.org/stable/c/4525525cb7161d08f95d0e47025323dd10214313
- https://git.kernel.org/stable/c/499839eca34ad62d43025ec0b46b80e77065f6d8
- https://git.kernel.org/stable/c/4ac4e023ed7ab1c7c67d2d12b7b6198fcd099e5c
- https://git.kernel.org/stable/c/5024cce888e11e5688f77df81db9e14828495d64
