CVE-2024-49921
📋 TL;DR
This CVE addresses a null pointer dereference vulnerability in the AMD display driver component of the Linux kernel. If exploited, it could cause a kernel panic or system crash, affecting systems running vulnerable Linux kernel versions with AMD graphics hardware. The vulnerability requires local access to trigger.
💻 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 and denial of service, potentially causing data loss or system instability.
Likely Case
Local denial of service through system crash or instability when specific display operations are performed.
If Mitigated
Minimal impact with proper access controls preventing local attackers from triggering the vulnerable code path.
🎯 Exploit Status
Exploitation requires local access and ability to trigger specific display operations. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 5b35bf1a82eb29841b67ff5643ba83762250fc24 and be1fb44389ca3038ad2430dac4234669bc177ee3
Vendor Advisory: https://git.kernel.org/stable/c/5b35bf1a82eb29841b67ff5643ba83762250fc24
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution. 2. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable AMD display driver
linuxPrevent loading of vulnerable AMD display driver module
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local user access to systems with AMD graphics hardware
- Implement strict access controls and monitor for system crashes
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if AMD display driver is loaded: 'uname -r' and 'lsmod | grep amdgpu'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits and system remains stable during display operations📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- System crash reports
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for 'kernel panic' or 'Oops' events in system logs from hosts with AMD graphics