CVE-2025-37758 – A NULL pointer dereference vulnerability in the... (How to Fix)

Q: What is the severity of CVE-2025-37758?

CVE-2025-37758 has a CVSS score of 5.5 (MEDIUM). A NULL pointer dereference vulnerability in the Linux kernel's PATA PXA driver could cause kernel crashes or denial of service. This affects systems using the pata_pxa driver for PXA series PATA controllers, primarily embedded Linux devices. The vulnerability occurs when devm_ioremap() fails but the return value isn't checked before use.

📋 TL;DR

A NULL pointer dereference vulnerability in the Linux kernel's PATA PXA driver could cause kernel crashes or denial of service. This affects systems using the pata_pxa driver for PXA series PATA controllers, primarily embedded Linux devices. The vulnerability occurs when devm_ioremap() fails but the return value isn't checked before use.

💻 Affected Systems

Products:

Linux kernel with pata_pxa driver

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

Operating Systems: Linux distributions using vulnerable kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable if pata_pxa driver is compiled into kernel or loaded as module, and system uses PXA series PATA controllers (common in embedded ARM devices).

📦 What is this software?

Debian Linux by Debian

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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 →

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 requiring physical access to restart affected embedded devices.

🟠

Likely Case

System instability or kernel crash when the driver fails to initialize properly during boot or module loading.

🟢

If Mitigated

Graceful driver initialization failure without system crash if the NULL check is implemented.

🌐 Internet-Facing: LOW - This is a local driver initialization issue, not remotely exploitable.

🏢 Internal Only: MEDIUM - Affects system stability during boot/driver initialization on vulnerable embedded systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Exploitation requires triggering devm_ioremap() failure during driver initialization, which is difficult to control externally. This is primarily a stability issue rather than a security exploit.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Fixed in stable kernel trees via commits referenced in CVE

Vendor Advisory: https://git.kernel.org/stable/c/17d5e6e915fad5a261db3698c9c5bbe702102d7c

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix commits. 2. For embedded systems: Update kernel via vendor firmware updates. 3. Rebuild kernel if using custom builds. 4. Reboot system after update.

🔧 Temporary Workarounds

Disable pata_pxa driver

linux

Prevent loading of vulnerable driver if not needed

echo 'blacklist pata_pxa' > /etc/modprobe.d/blacklist-pata_pxa.conf
rmmod pata_pxa

Build kernel without pata_pxa

linux

Compile kernel without the vulnerable driver

In kernel config: CONFIG_PATA_PXA=n

🧯 If You Can't Patch

Ensure systems don't use PXA PATA controllers or disable the driver
Implement monitoring for kernel crashes/panics on affected systems

🔍 How to Verify

Check if Vulnerable:

Check if pata_pxa module is loaded: 'lsmod | grep pata_pxa' and check kernel version against patched versions

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits or test that NULL pointer check exists in pxa_ata_probe() function

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
'BUG: unable to handle kernel NULL pointer dereference' in dmesg
Driver initialization failures

Network Indicators:

None - this is a local driver issue

SIEM Query:

source="kernel" AND "NULL pointer dereference" AND "pata_pxa" OR source="dmesg" AND "panic"

📊 Metadata

CVE ID: CVE-2025-37758

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

CWE: CWE-476

EPSS Score: 0.03% exploit probability (6.2th percentile)

Published: May 1, 2025

Last Updated: November 4, 2025

🔗 References

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