CVE-2024-39471 – This CVE addresses an out-of-bounds read vulner... (How to Fix)

Q: What is the severity of CVE-2024-39471?

CVE-2024-39471 has a CVSS score of 7.1 (HIGH). This CVE addresses an out-of-bounds read vulnerability in the AMD GPU driver (drm/amdgpu) in the Linux kernel. When the sdma_v4_0_irq_id_to_seq function returns -EINVAL, the system could read beyond allocated memory boundaries. This affects Linux systems with AMD GPUs using the vulnerable driver.

📋 TL;DR

This CVE addresses an out-of-bounds read vulnerability in the AMD GPU driver (drm/amdgpu) in the Linux kernel. When the sdma_v4_0_irq_id_to_seq function returns -EINVAL, the system could read beyond allocated memory boundaries. This affects Linux systems with AMD GPUs using the vulnerable driver.

💻 Affected Systems

Products:

Linux kernel with AMD GPU driver (drm/amdgpu)

Versions: Linux kernel versions containing the vulnerable code before the fix commits

Operating Systems: Linux distributions with vulnerable kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems with AMD GPUs using the sdma_v4_0 driver component. Systems without AMD GPUs or with different GPU drivers 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 →

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 →

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 system crash, denial of service, or potential privilege escalation if combined with other vulnerabilities.

🟠

Likely Case

System instability, kernel panic, or denial of service causing system crashes.

🟢

If Mitigated

Minimal impact with proper kernel hardening and privilege separation in place.

🌐 Internet-Facing: LOW - Requires local access or existing system compromise to trigger.

🏢 Internal Only: MEDIUM - Local users or processes could trigger the vulnerability, potentially causing system instability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local access to trigger the vulnerable code path. Exploitation would need to control inputs to the sdma_v4_0_irq_id_to_seq function.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel versions containing the fix commits: 011552f29f20842c9a7a21bffe1f6a2d6457ba46, 0964c84b93db7fbf74f357c1e20957850e092db3, 5594971e02764aa1c8210ffb838cb4e7897716e8, 5b0a3dc3e87821acb80e841b464d335aff242691, 8112fa72b7f139052843ff484130d6f97e9f052f

Vendor Advisory: https://git.kernel.org/stable/c/011552f29f20842c9a7a21bffe1f6a2d6457ba46

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.

🔧 Temporary Workarounds

Disable AMD GPU driver module

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 vulnerable kernels
Implement strict privilege separation and limit user capabilities

🔍 How to Verify

Check if Vulnerable:

Check if running kernel version is before the fix commits: uname -r and compare with kernel changelog

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes one of the fix commits: grep -i 'CVE-2024-39471\|sdma_v4_0_irq_id_to_seq' /boot/config-$(uname -r) or check kernel source

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
Out of bounds memory access errors in dmesg
AMD GPU driver crash logs

Network Indicators:

None - local vulnerability only

SIEM Query:

source="kernel" AND ("panic" OR "Oops" OR "BUG") AND ("amdgpu" OR "sdma_v4_0")

📊 Metadata

CVE ID: CVE-2024-39471

CVSS v3 Score: 7.1 (HIGH)

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

CWE: CWE-125

Published: June 25, 2024

Last Updated: November 21, 2024

🔗 References

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

If you're affected by CVE-2024-39471, you might also want to check these: