CVE-2023-53081 – A race condition vulnerability in the Linux ker... (How to Fix)

Q: What is the severity of CVE-2023-53081?

CVE-2023-53081 has a CVSS score of 7.8 (HIGH). A race condition vulnerability in the Linux kernel's OCFS2 filesystem can cause data corruption when buffered writes fail. This occurs when a failed write leaves dirty pages beyond the end of file, which can result in data loss when those pages are later written back. Systems using OCFS2 filesystems are affected.

📋 TL;DR

A race condition vulnerability in the Linux kernel's OCFS2 filesystem can cause data corruption when buffered writes fail. This occurs when a failed write leaves dirty pages beyond the end of file, which can result in data loss when those pages are later written back. Systems using OCFS2 filesystems are affected.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific kernel versions with OCFS2 support before the fix commits

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ✅ No

Notes: Only affects systems using OCFS2 (Oracle Cluster File System) filesystems. Systems not using OCFS2 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 →

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 →

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

Permanent data corruption and loss in OCFS2 filesystems, potentially affecting critical system files or application data.

🟠

Likely Case

Intermittent data corruption in OCFS2 filesystems during write operations, leading to application errors or file system inconsistencies.

🟢

If Mitigated

Minimal impact if systems are not using OCFS2 filesystems or have limited write operations to affected filesystems.

🌐 Internet-Facing: LOW - This is a local filesystem vulnerability requiring local access to the affected system.

🏢 Internal Only: MEDIUM - Internal systems using OCFS2 filesystems for shared storage or clustering could experience data corruption affecting multiple systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Exploitation requires specific conditions: using OCFS2 filesystem, triggering failed write operations, and race conditions during page writeback.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions containing commits: 1629f6f522b2d058019710466a84b240683bbee3, 205759c6c18f54659b0b5976b14a52d1b3eb9f57, 47eb055ad3588fc96d34e9e1dd87b210ce62906b, 4c24eb49ab44351424ac8fe8567f91ea48a06089, 90410bcf873cf05f54a32183afff0161f44f9715

Vendor Advisory: https://git.kernel.org/stable/c/1629f6f522b2d058019710466a84b240683bbee3

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.

🔧 Temporary Workarounds

Avoid OCFS2 usage

linux

Use alternative filesystems instead of OCFS2 for storage

Limit write operations

linux

Reduce write operations to OCFS2 filesystems to minimize exposure

🧯 If You Can't Patch

Monitor OCFS2 filesystems for corruption using filesystem checks
Implement regular backups of critical data on OCFS2 filesystems

🔍 How to Verify

Check if Vulnerable:

Check if system uses OCFS2 filesystems: 'mount | grep ocfs2' and check kernel version

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version contains fix commits: 'uname -r' and check against patched versions

📡 Detection & Monitoring

Log Indicators:

Filesystem corruption errors in system logs
OCFS2 filesystem error messages
Application errors related to file I/O

SIEM Query:

source="kernel" AND ("ocfs2" OR "filesystem corruption")

📊 Metadata

CVE ID: CVE-2023-53081

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 (5.9th percentile)

Published: May 2, 2025

Last Updated: November 12, 2025

🔗 References

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