CVE-2022-50438 – This CVE describes a memory leak vulnerability ... (How to Fix)

Q: What is the severity of CVE-2022-50438?

CVE-2022-50438 has a CVSS score of 5.5 (MEDIUM). This CVE describes a memory leak vulnerability in the Linux kernel's HiNIC network driver. When reading function tables via debugfs, certain input parameters cause the driver to fail to release allocated memory. This affects systems using HiNIC network cards with vulnerable kernel versions.

📋 TL;DR

This CVE describes a memory leak vulnerability in the Linux kernel's HiNIC network driver. When reading function tables via debugfs, certain input parameters cause the driver to fail to release allocated memory. This affects systems using HiNIC network cards with vulnerable kernel versions.

💻 Affected Systems

Products:

Linux kernel with HiNIC driver

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

Operating Systems: Linux distributions with vulnerable kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems with HiNIC network hardware and debugfs enabled. Debugfs access typically requires root or privileged user.

📦 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 →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Sustained exploitation could lead to kernel memory exhaustion, causing system instability, denial of service, or potential kernel crashes.

🟠

Likely Case

Gradual memory consumption over time leading to performance degradation and eventual system instability requiring reboot.

🟢

If Mitigated

Minimal impact with proper monitoring and memory limits in place, though still represents resource waste.

🌐 Internet-Facing: LOW - Requires local access to debugfs interface which is typically not exposed externally.

🏢 Internal Only: MEDIUM - Local users or processes with debugfs access could exploit this to degrade system performance.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local access and debugfs permissions. Exploitation involves repeatedly triggering the vulnerable code path.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions containing commits: 4c1f602df8956bc0decdafd7e4fc7eef50c550b1, bb01910763f935b16538084b4269696e0de17f79, e6765fe8de372a84f8dbe9e03ec13c7c70f946b8, ee98ab337036c983239aa550850861c88a5c4262

Vendor Advisory: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4c1f602df8956bc0decdafd7e4fc7eef50c550b1

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from your distribution. 2. Reboot system to load new kernel. 3. Verify HiNIC driver is using patched code.

🔧 Temporary Workarounds

Disable debugfs access

linux

Restrict access to debugfs to prevent exploitation

mount -o remount,nodev,noexec,nosuid /sys/kernel/debug

Remove debugfs mount

linux

Unmount debugfs filesystem entirely

umount /sys/kernel/debug

🧯 If You Can't Patch

Implement strict access controls on debugfs directory
Monitor system memory usage and kernel logs for signs of memory exhaustion

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if HiNIC driver is loaded: lsmod | grep hinic && uname -r

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is patched and check if debugfs access triggers memory leaks via monitoring tools

📡 Detection & Monitoring

Log Indicators:

Kernel OOM (Out of Memory) messages
System performance degradation logs
Memory allocation failures

Network Indicators:

None - this is a local memory management issue

SIEM Query:

Search for: 'Out of memory' OR 'kernel: Memory cgroup out of memory' AND 'hinic' in system logs

📊 Metadata

CVE ID: CVE-2022-50438

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-401

EPSS Score: 0.02% exploit probability (5.3th percentile)

Published: October 1, 2025

Last Updated: January 21, 2026

🔗 References

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