CVE-2024-56608 – This CVE describes an out-of-bounds array acces... (How to Fix)

Q: What is the severity of CVE-2024-56608?

CVE-2024-56608 has a CVSS score of 7.8 (HIGH). This CVE describes an out-of-bounds array access vulnerability in the AMD GPU display driver for Linux kernels. An attacker could potentially cause kernel crashes or execute arbitrary code by triggering this bug. Systems using AMD graphics hardware with affected Linux kernel versions are vulnerable.

📋 TL;DR

This CVE describes an out-of-bounds array access vulnerability in the AMD GPU display driver for Linux kernels. An attacker could potentially cause kernel crashes or execute arbitrary code by triggering this bug. Systems using AMD graphics hardware with affected Linux kernel versions are vulnerable.

💻 Affected Systems

Products:

AMD GPU drivers for Linux
Linux kernel with AMD display driver support

Versions: Linux kernel versions containing the vulnerable dcn21_link_encoder_create function before the fix

Operating Systems: Linux distributions with AMD GPU support

Default Config Vulnerable: ⚠️ Yes

Notes: Requires AMD GPU hardware and the amdgpu driver module to be loaded. Systems without AMD graphics are not affected.

📦 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 memory corruption leading to privilege escalation, arbitrary code execution, or complete system compromise.

🟠

Likely Case

Kernel panic or system crash (denial of service) when the vulnerable function is triggered.

🟢

If Mitigated

System remains stable with proper bounds checking preventing memory corruption.

🌐 Internet-Facing: LOW - Requires local access or ability to load malicious kernel modules.

🏢 Internal Only: MEDIUM - Local attackers or malicious users could exploit this to crash systems or potentially escalate privileges.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access and ability to trigger the vulnerable code path through GPU operations. No public exploits are known at this time.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel versions with commit 08ac5fdb9c6dc34d0ed4bc64ce3c5c3d411b3b53 or related fixes

Vendor Advisory: https://git.kernel.org/stable/c/08ac5fdb9c6dc34d0ed4bc64ce3c5c3d411b3b53

Restart Required: Yes

Instructions:

1. Update Linux kernel to a patched version from your distribution's repositories. 2. Rebuild and reload the amdgpu kernel module if using DKMS. 3. Reboot the system to load the patched kernel.

🔧 Temporary Workarounds

Disable AMD GPU driver

linux

Prevent loading of the vulnerable amdgpu kernel module

echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist-amdgpu.conf
update-initramfs -u
reboot

🧯 If You Can't Patch

Restrict local user access to systems with AMD GPUs
Implement strict module signing to prevent unauthorized kernel module loading

🔍 How to Verify

Check if Vulnerable:

Check if the amdgpu module is loaded and your kernel version is unpatched: lsmod | grep amdgpu && uname -r

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated and check for the fix commit in kernel source: grep -r 'dcn21_link_encoder_create' /usr/src/linux-headers-$(uname -r)/

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
UBSAN array-index-out-of-bounds errors in dmesg
amdgpu driver crash logs

Network Indicators:

None - this is a local vulnerability

SIEM Query:

source="kernel" AND ("UBSAN: array-index-out-of-bounds" OR "dcn21_link_encoder_create" OR "amdgpu crash")

📊 Metadata

CVE ID: CVE-2024-56608

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-129

Published: December 27, 2024

Last Updated: November 3, 2025

🔗 References

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