CVE-2024-46778
📋 TL;DR
This CVE addresses a NULL pointer dereference vulnerability in the AMD display driver component of the Linux kernel. The vulnerability occurs when the code incorrectly checks a pointer address instead of its boolean value, potentially leading to kernel crashes or instability. Systems running affected Linux kernel versions with AMD graphics hardware are impacted.
💻 Affected Systems
- Linux kernel with AMD display driver (drm/amd/display)
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash, denial of service, or potential local privilege escalation if combined with other vulnerabilities.
Likely Case
System instability, display driver crashes, or application failures when using AMD graphics hardware.
If Mitigated
Minimal impact with proper kernel hardening and privilege separation in place.
🎯 Exploit Status
Exploitation requires local access and knowledge of triggering the specific code path. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 4e2b49a85e7974d21364798c5d4aa8070aa864d9 and a7b38c7852093385d0605aa3c8a2efd6edd1edfd
Vendor Advisory: https://git.kernel.org/stable/c/4e2b49a85e7974d21364798c5d4aa8070aa864d9
Restart Required: Yes
Instructions:
1. Update to a patched Linux kernel version from your distribution's repositories. 2. Reboot the system to load the new kernel. 3. Verify the kernel version after reboot.
🔧 Temporary Workarounds
Disable AMD display driver
linuxTemporarily disable the affected AMD display driver module
sudo modprobe -r amdgpu
echo 'blacklist amdgpu' | sudo tee /etc/modprobe.d/blacklist-amdgpu.conf
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor system logs for kernel panic or display driver crash events
🔍 How to Verify
Check if Vulnerable:
Check if your kernel version includes the vulnerable code by examining kernel source or checking distribution security advisoriesCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or check with 'uname -r' after updating to a patched version📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- AMD display driver crash logs
- System crash/reboot events
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "amdgpu" AND "crash")