CVE-2024-56785 – This CVE addresses a Device Tree Source (DTS) c... (How to Fix)

Q: What is the severity of CVE-2024-56785?

CVE-2024-56785 has a CVSS score of 5.5 (MEDIUM). This CVE addresses a Device Tree Source (DTS) configuration issue in the Linux kernel for MIPS Loongson64 systems, specifically affecting PCIe port node definitions. The vulnerability causes kernel warnings and potential device tree parsing failures during boot, affecting systems using Loongson64 processors with ls7a chipsets.

📋 TL;DR

This CVE addresses a Device Tree Source (DTS) configuration issue in the Linux kernel for MIPS Loongson64 systems, specifically affecting PCIe port node definitions. The vulnerability causes kernel warnings and potential device tree parsing failures during boot, affecting systems using Loongson64 processors with ls7a chipsets.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific kernel versions with the vulnerable DTS configuration for Loongson64 ls7a

Operating Systems: Linux distributions running on MIPS Loongson64 hardware with ls7a chipsets

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems using MIPS Loongson64 processors with ls7a chipsets. Requires specific device tree configurations to be vulnerable.

📦 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...

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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 →

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

System boot failure or PCIe device malfunction due to incorrect device tree parsing, potentially causing denial of service for affected hardware components.

🟠

Likely Case

Kernel warning messages during boot and potential PCIe device initialization issues, but system remains operational with degraded functionality.

🟢

If Mitigated

Minor boot-time warnings with no functional impact if system tolerates the device tree parsing issues.

🌐 Internet-Facing: LOW - This is a local device configuration issue requiring physical or privileged access to the affected system.

🏢 Internal Only: MEDIUM - Affects system stability and PCIe device functionality for internal infrastructure using vulnerable Loongson64 hardware.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: HIGH

This is a configuration error rather than a traditional security vulnerability. Exploitation would require modifying device tree sources or triggering specific hardware conditions.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel commits: 01575f2ff8ba578a3436f230668bd056dc2eb823, 4fbd66d8254cedfd1218393f39d83b6c07a01917, 5a2eaa3ad2b803c7ea442c6db7379466ee73c024, 8ef9ea1503d0a129cc6f5cf48fb63633efa5d766, a7fd78075031871bc68fc56fdaa6e7a3934064b1

Vendor Advisory: https://git.kernel.org/stable/c/01575f2ff8ba578a3436f230668bd056dc2eb823

Restart Required: Yes

Instructions:

1. Update to a kernel version containing the fix commits. 2. Rebuild device tree blobs if using custom DTS. 3. Reboot the system to load the patched kernel.

🔧 Temporary Workarounds

Ignore kernel warnings

linux

Continue operation with warning messages if PCIe functionality is not critical

🧯 If You Can't Patch

Monitor system logs for device tree warnings and PCIe device failures
Consider disabling non-critical PCIe devices if stability issues occur

🔍 How to Verify

Check if Vulnerable:

Check kernel boot logs for DTS warnings related to PCIe port nodes on Loongson64 systems: dmesg | grep -i 'interrupt_provider\|address-cells\|pci@1a000000'

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits and check that boot warnings no longer appear

📡 Detection & Monitoring

Log Indicators:

Kernel warnings about '#interrupt-cells' without interrupt provider
Warnings about missing '#address-cells' in PCI bridge nodes
Device tree parsing errors during boot

SIEM Query:

source="kernel" AND ("interrupt_provider" OR "address-cells" OR "pci@1a000000")

📊 Metadata

CVE ID: CVE-2024-56785

CVSS v3 Score: 5.5 (MEDIUM)

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

EPSS Score: 0.04% exploit probability (10.8th percentile)

Published: January 8, 2025

Last Updated: November 3, 2025

🔗 References

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