CVE-2024-39291
📋 TL;DR
This CVE describes a buffer overflow vulnerability in the AMD GPU driver within the Linux kernel. The vulnerability could allow local attackers to execute arbitrary code or cause denial of service by exploiting insufficient buffer size in microcode loading functions. Systems using affected AMD GPU hardware with vulnerable kernel versions are impacted.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially leading to full system compromise.
Likely Case
Kernel panic or system crash resulting in denial of service.
If Mitigated
Truncated firmware path causing GPU initialization failure but no code execution.
🎯 Exploit Status
Requires local access and knowledge of chip_name values that trigger overflow. Buffer overflow is in kernel space.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 19bd9537b6bc1c882df25206c15917214d8e9460 or acce6479e30f73ab0872e93a75aed1fb791d04ec
Vendor Advisory: https://git.kernel.org/stable/c/19bd9537b6bc1c882df25206c15917214d8e9460
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Reboot system. 3. Verify kernel version and that amdgpu module loads successfully.
🔧 Temporary Workarounds
Disable amdgpu module
linuxPrevent loading of vulnerable AMD GPU driver
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist-amdgpu.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local access to systems with vulnerable configurations
- Implement strict privilege separation and limit user access to GPU functionality
🔍 How to Verify
Check if Vulnerable:
Check if amdgpu module is loaded and kernel version is vulnerable: 'lsmod | grep amdgpu' and 'uname -r'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits and amdgpu module loads without errors in dmesg📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- amdgpu module load failures in dmesg
- GPU initialization errors
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for: 'amdgpu.*failed to load firmware' OR 'kernel panic' OR 'buffer overflow' in system logs🔗 References
- https://git.kernel.org/stable/c/19bd9537b6bc1c882df25206c15917214d8e9460
- https://git.kernel.org/stable/c/acce6479e30f73ab0872e93a75aed1fb791d04ec
- https://git.kernel.org/stable/c/f1b6a016dfa45cedc080d36fa5d6f22237d80e8b
- https://git.kernel.org/stable/c/19bd9537b6bc1c882df25206c15917214d8e9460
- https://git.kernel.org/stable/c/acce6479e30f73ab0872e93a75aed1fb791d04ec
- https://git.kernel.org/stable/c/f1b6a016dfa45cedc080d36fa5d6f22237d80e8b
