CVE-2023-53282
📋 TL;DR
A use-after-free vulnerability in the Linux kernel's lpfc SCSI driver allows local attackers to potentially crash the system or execute arbitrary code. This affects systems using Linux kernels with the lpfc driver loaded, typically those with Emulex Fibre Channel HBAs. Attackers need local access to trigger the vulnerability via sysfs firmware write operations.
💻 Affected Systems
- Linux kernel with lpfc 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, leading to complete system compromise.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
No impact if sysfs firmware write access is restricted or driver not loaded.
🎯 Exploit Status
Requires local access and ability to write to sysfs firmware interface. Exploit would need to overcome KASLR and other kernel protections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits: 21681b81b9ae, 51ab4eb1a25e, 8becb97918f0, 8dfefa8f424a
Vendor Advisory: https://git.kernel.org/stable/c/21681b81b9ae548c5dae7ae00d931197a27f480c
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution. 2. Reboot system to load new kernel. 3. Verify lpfc driver version is updated.
🔧 Temporary Workarounds
Restrict sysfs firmware write access
linuxLimit access to /sys/class/scsi_host/host*/fw_upgrade to root only
chmod 600 /sys/class/scsi_host/host*/fw_upgrade
chown root:root /sys/class/scsi_host/host*/fw_upgrade
Unload lpfc driver
linuxRemove vulnerable driver if not needed
modprobe -r lpfc
🧯 If You Can't Patch
- Restrict local user access to systems with vulnerable kernel
- Implement strict access controls on sysfs interface
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if lpfc module is loaded: uname -r && lsmod | grep lpfcCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and check for KFENCE warnings in dmesg📡 Detection & Monitoring
Log Indicators:
- KFENCE use-after-free warnings in kernel logs
- lpfc_wr_object+0x235/0x310 in stack traces
- System crashes or kernel panics
Network Indicators:
- None - local vulnerability
SIEM Query:
source="kernel" AND "KFENCE: use-after-free" AND "lpfc_wr_object"