CVE-2023-53451 – This CVE describes a NULL pointer dereference v... (How to Fix)

Q: What is the severity of CVE-2023-53451?

CVE-2023-53451 has a CVSS score of 5.5 (MEDIUM). This CVE describes a NULL pointer dereference vulnerability in the qla2xxx SCSI driver in the Linux kernel. If exploited, it could cause a kernel panic or system crash on systems using QLogic Fibre Channel adapters. This affects Linux systems with the vulnerable driver loaded.

📋 TL;DR

This CVE describes a NULL pointer dereference vulnerability in the qla2xxx SCSI driver in the Linux kernel. If exploited, it could cause a kernel panic or system crash on systems using QLogic Fibre Channel adapters. This affects Linux systems with the vulnerable driver loaded.

💻 Affected Systems

Products:

Linux kernel with qla2xxx driver

Versions: Specific kernel versions containing the vulnerable code (check git commits for exact ranges)

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems with QLogic Fibre Channel adapters where the qla2xxx driver is loaded and active.

📦 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 →

⚠️ 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 or kernel panic requiring reboot, resulting in temporary service disruption.

🟢

If Mitigated

Minimal impact if systems are redundant and can failover, or if driver is not in use.

🌐 Internet-Facing: LOW - This is a local kernel driver vulnerability requiring local access or specific hardware.

🏢 Internal Only: MEDIUM - Could affect servers with QLogic adapters in data centers, potentially disrupting critical services.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Exploitation requires local access and specific conditions to trigger the NULL pointer dereference. No public exploits known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions with the git commits referenced in the CVE

Vendor Advisory: https://git.kernel.org/stable/c/02405f4023866ae91a611b5b85cb2e074ec2de5a

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version. 2. Reboot system to load new kernel. 3. Verify qla2xxx driver is functioning correctly.

🔧 Temporary Workarounds

Unload qla2xxx driver

linux

Temporarily unload the vulnerable driver if QLogic adapters are not required

modprobe -r qla2xxx

🧯 If You Can't Patch

Restrict local access to systems with vulnerable driver
Implement monitoring for kernel panics and system crashes

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if qla2xxx module is loaded: lsmod | grep qla2xxx

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated and check dmesg for qla2xxx driver errors

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages in /var/log/messages or dmesg
System crash reports
qla2xxx driver error messages

Network Indicators:

Sudden loss of Fibre Channel connectivity
Storage array connection drops

SIEM Query:

source="kernel" AND ("panic" OR "Oops" OR "qla2xxx")

📊 Metadata

CVE ID: CVE-2023-53451

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: 0.02% exploit probability (5.5th percentile)

Published: October 1, 2025

Last Updated: January 16, 2026

🔗 References

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