CVE-2022-50354
📋 TL;DR
This CVE-2022-50354 is a NULL pointer dereference vulnerability in the Linux kernel's AMD GPU driver (amdkfd). It allows local attackers to cause a kernel panic (denial of service) by triggering specific error conditions during GPU process cleanup. Systems using AMD GPUs with the affected kernel driver are vulnerable.
💻 Affected Systems
- Linux kernel with AMD GPU driver (amdgpu/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 →⚠️ 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
Local denial of service through kernel panic when specific GPU operations fail during process cleanup.
If Mitigated
Minimal impact if systems have proper access controls preventing local user exploitation.
🎯 Exploit Status
Requires local access and ability to trigger specific GPU driver error conditions. Not trivial but feasible for knowledgeable attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commit 29d48b87db64b6697ddad007548e51d032081c59 or later
Vendor Advisory: https://git.kernel.org/stable/c/29d48b87db64b6697ddad007548e51d032081c59
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix commit. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel. 3. Rebuild kernel if using custom kernel. 4. No reboot required for hotpatch if available.
🔧 Temporary Workarounds
Restrict local access
allLimit local user access to systems with AMD GPUs to reduce attack surface.
Disable AMD GPU kernel driver
LinuxRemove or blacklist amdgpu/amdkfd modules if GPU functionality not required.
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist.conf
echo 'blacklist amdkfd' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Implement strict access controls to prevent local user exploitation.
- Monitor system logs for kernel panic events related to AMD GPU driver.
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if AMD GPU driver is loaded: 'uname -r' and 'lsmod | grep amdgpu'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commit: 'git log --oneline | grep 29d48b87db64b6697ddad007548e51d032081c59' or check kernel changelog.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs mentioning 'NULL pointer dereference'
- AMD GPU driver error messages in dmesg
- System crash/reboot events
Network Indicators:
- None - local exploit only
SIEM Query:
source="kernel" AND ("NULL pointer" OR "amdgpu" OR "amdkfd") AND (panic OR oops OR crash)