CVE-2023-52921
📋 TL;DR
A use-after-free vulnerability in the AMD GPU driver for Linux kernel allows local attackers to potentially crash the system or execute arbitrary code with kernel privileges. This affects Linux systems with AMD graphics hardware using the amdgpu driver. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Linux kernel with AMD GPU driver (amdgpu)
📦 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 to kernel mode, allowing complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Kernel panic leading to system crash and denial of service, potentially causing data loss or service disruption.
If Mitigated
Limited to denial of service if exploit fails or system has additional kernel hardening protections.
🎯 Exploit Status
Requires local access and knowledge of kernel exploitation techniques. The vulnerability is in a specific driver function that may require specific conditions to trigger.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits 90e065677e0362a777b9db97ea21d43a39211399 and e08e9dd09809b16f8f8cee8c466841b33d24ed96
Vendor Advisory: https://git.kernel.org/stable/c/90e065677e0362a777b9db97ea21d43a39211399
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check your distribution's security advisories for specific patched kernel versions. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable AMD GPU driver module
linuxTemporarily disable the vulnerable amdgpu kernel module if AMD graphics are not essential
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist-amdgpu.conf
update-initramfs -u
reboot
Restrict access to GPU devices
linuxLimit which users can access GPU device files to reduce attack surface
chmod 600 /dev/dri/renderD*
chmod 600 /dev/dri/card*
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor system logs for kernel panic or crash events related to GPU operations
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if amdgpu module is loaded: 'uname -r' and 'lsmod | grep amdgpu'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is newer than fix commits and check dmesg for no recent amdgpu-related crashes📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- amdgpu driver crash logs
- System crash/reboot events
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "amdgpu")