CVE-2023-53603
📋 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, affecting systems using QLogic Fibre Channel adapters. The vulnerability requires local access to trigger.
💻 Affected Systems
- Linux kernel with qla2xxx driver
📦 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 →⚠️ 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
Local denial of service through system crash or kernel panic, requiring physical or remote shell access to trigger.
If Mitigated
Minimal impact with proper access controls preventing unauthorized local users from executing privileged operations.
🎯 Exploit Status
Requires local access and ability to trigger specific SCSI operations. No public exploit code has been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits: 4406fe8a96a946c7ea5724ee59625755a1d9c59d, 477bc74ad1add644b606bff6ba1284943c42818a, 6b504d06976fe4a61cc05dedc68b84fadb397f77, 7bbeff613ec0560fb2f6f8b405288f3f043adf64
Vendor Advisory: https://git.kernel.org/stable/c/4406fe8a96a946c7ea5724ee59625755a1d9c59d
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check with your distribution for specific patched kernel versions. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable qla2xxx module
linuxRemove or blacklist the qla2xxx kernel module if QLogic adapters are not needed
echo 'blacklist qla2xxx' >> /etc/modprobe.d/blacklist-qla2xxx.conf
rmmod qla2xxx
🧯 If You Can't Patch
- Restrict local user access to prevent unauthorized users from triggering the vulnerability
- Implement strict access controls and monitor for suspicious local activity
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if qla2xxx module is loaded: lsmod | grep qla2xxx && uname -rCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated beyond fix commits and qla2xxx module loads without issues📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/messages or dmesg
- System crash logs
- Unexpected system reboots
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for kernel panic events or unexpected system reboots in system logs