CVE-2024-56784
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in the AMD display driver component of the Linux kernel. An attacker with local access could exploit this to cause memory corruption, potentially leading to system crashes or arbitrary code execution with kernel privileges. Systems running affected Linux kernel versions with AMD graphics hardware are vulnerable.
💻 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
Local privilege escalation to kernel-level access, allowing complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Kernel panic or system crash causing denial of service, potentially requiring physical or remote console access to reboot.
If Mitigated
System remains stable with no impact if the vulnerable driver component is not loaded or if access controls prevent local user exploitation.
🎯 Exploit Status
Requires local access and knowledge of triggering the specific array bounds condition. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 2c437d9a0b496168e1a1defd17b531f0a526dbe9 and dff526dc3e27f5484f5ba11471b9fbbe681467f2
Vendor Advisory: https://git.kernel.org/stable/c/2c437d9a0b496168e1a1defd17b531f0a526dbe9
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version matches patched release.
🔧 Temporary Workarounds
Disable AMD display driver
LinuxPrevent loading of vulnerable driver module if AMD graphics not required
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local user access to prevent exploitation by untrusted users
- Implement strict privilege separation and limit users to minimal necessary permissions
🔍 How to Verify
Check if Vulnerable:
Check if AMD display driver is loaded: lsmod | grep amdgpu AND check kernel version against patched releasesCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits and AMD driver functions normally without crashes📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- AMD driver crash logs in dmesg
- System crash/reboot events
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "BUG") AND "amdgpu" OR source="dmesg" AND "segfault" AND "display"