CVE-2022-50030 – A buffer overflow vulnerability in the Linux ke... (How to Fix)

Q: What is the severity of CVE-2022-50030?

CVE-2022-50030 has a CVSS score of 7.8 (HIGH). A buffer overflow vulnerability in the Linux kernel's lpfc SCSI driver debugfs interface allows attackers to crash systems or potentially execute arbitrary code by providing malformed input. This affects Linux systems using the lpfc driver for Fibre Channel storage. Attackers with local access to debugfs can exploit this vulnerability.

📋 TL;DR

A buffer overflow vulnerability in the Linux kernel's lpfc SCSI driver debugfs interface allows attackers to crash systems or potentially execute arbitrary code by providing malformed input. This affects Linux systems using the lpfc driver for Fibre Channel storage. Attackers with local access to debugfs can exploit this vulnerability.

💻 Affected Systems

Products:

Linux kernel with lpfc SCSI driver

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

Operating Systems: Linux distributions with vulnerable kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Requires lpfc driver to be loaded and debugfs mounted. Debugfs is typically mounted at /sys/kernel/debug and requires root or appropriate permissions.

📦 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

Local privilege escalation to kernel-level code execution, potentially leading to full system compromise and data exfiltration.

🟠

Likely Case

Kernel panic or system crash causing denial of service and potential data loss from interrupted operations.

🟢

If Mitigated

Limited to denial of service if exploit attempts are detected and blocked by security controls.

🌐 Internet-Facing: LOW - Requires local access to debugfs interface, not typically exposed to internet.

🏢 Internal Only: MEDIUM - Malicious insiders or compromised internal accounts with debugfs access could exploit this vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local access to debugfs interface. No public exploit code has been identified, but buffer overflow vulnerabilities in kernel drivers are often targeted.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel with commits 2d544e9d19c1, 927907f1cbb3, b92506dc51f8, c29a4baaad38, or f8191d40aa61

Vendor Advisory: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2d544e9d19c109dfe34b3dc1253a8b2971abe060

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix commits. 2. Check distribution-specific security advisories. 3. Reboot system to load patched kernel.

🔧 Temporary Workarounds

Disable debugfs access

linux

Unmount debugfs or restrict access to prevent exploitation

umount /sys/kernel/debug
chmod 700 /sys/kernel/debug

Unload lpfc module

linux

Remove vulnerable driver if not required

rmmod lpfc

🧯 If You Can't Patch

Restrict debugfs access to root only and monitor for unauthorized access attempts
Implement strict access controls and monitoring for systems requiring lpfc driver functionality

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if lpfc module is loaded: 'uname -r' and 'lsmod | grep lpfc'

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is patched and test debugfs input handling

📡 Detection & Monitoring

Log Indicators:

Kernel panic logs
System crash reports
Unauthorized debugfs access attempts

Network Indicators:

None - local exploitation only

SIEM Query:

search 'kernel panic' OR 'system crash' AND 'lpfc' OR 'debugfs'

📊 Metadata

CVE ID: CVE-2022-50030

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-787

EPSS Score: 0.02% exploit probability (4.3th percentile)

Published: June 18, 2025

Last Updated: November 13, 2025

🔗 References

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