CVE-2023-53468 – A memory leak vulnerability in the Linux kernel... (How to Fix)

Q: What is the severity of CVE-2023-53468?

CVE-2023-53468 has a CVSS score of 5.5 (MEDIUM). A memory leak vulnerability in the Linux kernel's UBIFS filesystem driver allows attackers to cause denial of service by exhausting system memory. The vulnerability occurs when mounting a UBIFS filesystem fails during initialization, leaving allocated write buffer memory unreleased. This affects any system using UBIFS filesystems, particularly embedded Linux devices.

📋 TL;DR

A memory leak vulnerability in the Linux kernel's UBIFS filesystem driver allows attackers to cause denial of service by exhausting system memory. The vulnerability occurs when mounting a UBIFS filesystem fails during initialization, leaving allocated write buffer memory unreleased. This affects any system using UBIFS filesystems, particularly embedded Linux devices.

💻 Affected Systems

Products:

Linux Kernel

Versions: Kernel versions with UBIFS support before the fix commits

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable when UBIFS filesystem is mounted. UBIFS is primarily used in embedded systems with flash storage.

📦 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

System memory exhaustion leading to kernel panic and complete system crash, requiring physical reboot.

🟠

Likely Case

Gradual memory depletion causing system instability, performance degradation, and potential application failures.

🟢

If Mitigated

Minimal impact with proper memory monitoring and restart policies in place.

🌐 Internet-Facing: LOW - Requires local filesystem access or ability to mount UBIFS filesystems.

🏢 Internal Only: MEDIUM - Could be exploited by local users or through automated mounting processes.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires ability to trigger UBIFS mount failures repeatedly. No known public exploits.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions containing commits: 1f206002c6bc302bface871ef3f72c0bbcaa931c, 26ec45f1c504e15268383019df139d7983f1e67f, 3e29634eb56e6547272fe4e568f63421f8b3b9fa, 4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2, bf50229494f0443b3f08427d7df63e5a7e2a796a

Vendor Advisory: https://git.kernel.org/stable/c/1f206002c6bc302bface871ef3f72c0bbcaa931c

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.

🔧 Temporary Workarounds

Disable UBIFS mounting

linux

Prevent UBIFS filesystem mounting to avoid triggering the vulnerability

echo 'install ubifs /bin/false' >> /etc/modprobe.d/disable-ubifs.conf
rmmod ubifs

Monitor memory usage

linux

Implement memory monitoring to detect abnormal memory consumption

# Set up monitoring with tools like atop, htop, or custom scripts
# Configure alerts for high memory usage

🧯 If You Can't Patch

Implement strict access controls to prevent unauthorized users from mounting filesystems
Deploy memory monitoring with automated alerting for abnormal consumption patterns

🔍 How to Verify

Check if Vulnerable:

Check kernel version and verify if UBIFS module is loaded: uname -r && lsmod | grep ubifs

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits and test UBIFS mount failure scenarios while monitoring memory

📡 Detection & Monitoring

Log Indicators:

Kernel oom-killer messages
System memory exhaustion warnings
UBIFS mount failure messages in dmesg

Network Indicators:

N/A - Local vulnerability

SIEM Query:

source="kernel" AND ("out of memory" OR "oom-killer" OR "UBIFS error")

📊 Metadata

CVE ID: CVE-2023-53468

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 (5.5th percentile)

Published: October 1, 2025

Last Updated: January 20, 2026

🔗 References

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