CVE-2024-53227 – This CVE describes a use-after-free vulnerabili... (How to Fix)

Q: What is the severity of CVE-2024-53227?

CVE-2024-53227 has a CVSS score of 7.8 (HIGH). This CVE describes a use-after-free vulnerability in the Linux kernel's bfa SCSI driver. When bfad_im_module_init() fails during module initialization, the cleanup code incorrectly calls bfad_im_module_exit(), causing a double release of transport resources and triggering a kernel panic. This affects systems using the bfa driver for Brocade Fibre Channel adapters.

📋 TL;DR

This CVE describes a use-after-free vulnerability in the Linux kernel's bfa SCSI driver. When bfad_im_module_init() fails during module initialization, the cleanup code incorrectly calls bfad_im_module_exit(), causing a double release of transport resources and triggering a kernel panic. This affects systems using the bfa driver for Brocade Fibre Channel adapters.

💻 Affected Systems

Products:

Linux kernel with bfa driver

Versions: Linux kernel versions before the fix commits (specific versions vary by distribution)

Operating Systems: Linux distributions using vulnerable kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable when the bfa driver is loaded, typically on systems with Brocade Fibre Channel adapters.

📦 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 →

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 panic leading to system crash and denial of service, potentially causing data loss or service disruption.

🟠

Likely Case

System crash when loading or unloading the bfa driver module, resulting in denial of service.

🟢

If Mitigated

No impact if the vulnerable code path is not triggered during driver initialization.

🌐 Internet-Facing: LOW - This requires local access to load kernel modules.

🏢 Internal Only: MEDIUM - Local users with module loading privileges can trigger the crash.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires local access and module loading privileges. The crash is triggered by normal error handling code.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions containing the fix commits: 0ceac8012d3d, 178b8f38932d, 1ffdde30a90b, 3932c753f805, 8f5a97443b54

Vendor Advisory: https://git.kernel.org/stable/c/0ceac8012d3ddea3317f0d82934293d05feb8af1

Restart Required: Yes

Instructions:

1. Update Linux kernel to a version containing the fix commits. 2. Reboot the system. 3. Verify the bfa driver loads without errors.

🔧 Temporary Workarounds

Blacklist bfa driver

linux

Prevent loading of the vulnerable bfa driver module

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

Remove module loading capability

linux

Restrict module loading to prevent exploitation

sysctl -w kernel.modules_disabled=1

🧯 If You Can't Patch

Restrict module loading to privileged users only
Monitor for attempts to load the bfa driver module

🔍 How to Verify

Check if Vulnerable:

Check if bfa module is loaded: lsmod | grep bfa. Check kernel version: uname -r and compare with affected versions.

Check Version:

uname -r

Verify Fix Applied:

Attempt to load bfa module: modprobe bfa. If system doesn't crash and module loads, fix is likely applied.

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages in /var/log/kern.log or dmesg
KASAN reports of use-after-free in bfad_im_module_exit()
Failed module loading attempts for bfa driver

Network Indicators:

None - this is a local kernel vulnerability

SIEM Query:

source="kernel" AND ("KASAN" OR "use-after-free" OR "bfad_im_module_exit" OR "kernel panic")

📊 Metadata

CVE ID: CVE-2024-53227

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-416

Published: December 27, 2024

Last Updated: November 3, 2025

🔗 References

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🔗 Related Vulnerabilities

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