CVE-2022-50465 – This CVE-2022-50465 vulnerability in the Linux ... (How to Fix)

Q: What is the severity of CVE-2022-50465?

CVE-2022-50465 has a CVSS score of 5.5 (MEDIUM). This CVE-2022-50465 vulnerability in the Linux kernel's ext4 filesystem allows uninitialized memory from fast-commit journal blocks to leak to disk when unused space isn't properly zeroed out. This affects all Linux systems using ext4 filesystem with fast-commit journaling enabled. The vulnerability could expose sensitive kernel memory contents to persistent storage.

📋 TL;DR

This CVE-2022-50465 vulnerability in the Linux kernel's ext4 filesystem allows uninitialized memory from fast-commit journal blocks to leak to disk when unused space isn't properly zeroed out. This affects all Linux systems using ext4 filesystem with fast-commit journaling enabled. The vulnerability could expose sensitive kernel memory contents to persistent storage.

💻 Affected Systems

Products:

Linux kernel

Versions: Linux kernel versions with ext4 fast-commit feature (introduced around 5.10) up to patched versions

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems using ext4 filesystem with fast-commit journaling enabled (default in many modern distributions). Systems using other filesystems or without fast-commit are not vulnerable.

📦 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

Sensitive kernel memory containing passwords, encryption keys, or other privileged data could be written to disk and potentially recovered by attackers with disk access.

🟠

Likely Case

Random kernel memory fragments containing no sensitive information are written to disk, creating potential information disclosure but no direct system compromise.

🟢

If Mitigated

With proper access controls and encryption, the leaked data remains inaccessible to unauthorized users, minimizing practical impact.

🌐 Internet-Facing: LOW - This requires local filesystem access and doesn't provide remote exploitation capabilities.

🏢 Internal Only: MEDIUM - Local attackers or malicious insiders with disk access could potentially recover sensitive information from leaked memory.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access to read disk contents and knowledge of memory layout. No known active exploitation in the wild.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel versions containing commits 594bc43b410316d70bb42aeff168837888d96810 and related fixes

Vendor Advisory: https://git.kernel.org/stable/c/594bc43b410316d70bb42aeff168837888d96810

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version with 'uname -r'.

🔧 Temporary Workarounds

Disable fast-commit journaling

linux

Temporarily disable ext4 fast-commit feature to prevent memory leakage

tune2fs -O ^fast_commit /dev/[device]

Use different filesystem

linux

Use alternative filesystem like XFS or ext4 without fast-commit

🧯 If You Can't Patch

Implement full disk encryption to protect leaked data from unauthorized access
Restrict physical and logical access to storage devices containing ext4 partitions

🔍 How to Verify

Check if Vulnerable:

Check kernel version and ext4 mount options: 'uname -r' and 'mount | grep ext4' to see if fast_commit is enabled

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is patched and check dmesg for ext4 initialization messages

📡 Detection & Monitoring

Log Indicators:

Kernel logs showing ext4 fast-commit operations
Filesystem integrity check anomalies

Network Indicators:

None - this is a local filesystem vulnerability

SIEM Query:

source="kernel" AND "ext4" AND ("fast_commit" OR "journal")

📊 Metadata

CVE ID: CVE-2022-50465

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 16, 2026

🔗 References

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

If you're affected by CVE-2022-50465, you might also want to check these: