CVE-2022-48789 – This is a use-after-free vulnerability in the L... (How to Fix)

Q: What is the severity of CVE-2022-48789?

CVE-2022-48789 has a CVSS score of 7.8 (HIGH). This is a use-after-free vulnerability in the Linux kernel's NVMe over TCP subsystem. It allows attackers with local access to potentially crash the system or execute arbitrary code by exploiting a race condition during error recovery. Systems using NVMe over TCP storage with affected Linux kernel versions are vulnerable.

📋 TL;DR

This is a use-after-free vulnerability in the Linux kernel's NVMe over TCP subsystem. It allows attackers with local access to potentially crash the system or execute arbitrary code by exploiting a race condition during error recovery. Systems using NVMe over TCP storage with affected Linux kernel versions are vulnerable.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific affected versions not specified in CVE description, but patches exist for multiple stable branches.

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems using NVMe over TCP storage protocol. Systems without NVMe over TCP enabled 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

Local privilege escalation leading to kernel compromise, system crash, or arbitrary code execution with kernel privileges.

🟠

Likely Case

Kernel panic or system crash causing denial of service.

🟢

If Mitigated

No impact if patched or if NVMe over TCP is not in use.

🌐 Internet-Facing: LOW - Requires local access to the system.

🏢 Internal Only: MEDIUM - Local attackers or malicious users could exploit this to disrupt systems or potentially escalate privileges.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH - Requires precise timing to trigger race condition and local access.

Exploitation requires local access and precise timing to trigger the race condition between error recovery and async event handling.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Multiple stable kernel versions with fixes: 5.10.110, 5.15.33, 5.16.20, 5.17.3, and later

Vendor Advisory: https://git.kernel.org/stable/c/5e42fca37ccc76f39f73732661bd47254cad5982

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 after reboot.

🔧 Temporary Workarounds

Disable NVMe over TCP

linux

If NVMe over TCP is not required, disable it to eliminate the attack surface.

modprobe -r nvme_tcp
echo 'blacklist nvme_tcp' >> /etc/modprobe.d/blacklist.conf

🧯 If You Can't Patch

Restrict local access to systems using NVMe over TCP
Implement strict privilege separation and limit users who can access NVMe storage systems

🔍 How to Verify

Check if Vulnerable:

Check if NVMe over TCP module is loaded: lsmod | grep nvme_tcp. If loaded and kernel version is unpatched, system is vulnerable.

Check Version:

uname -r

Verify Fix Applied:

Check kernel version after update: uname -r. Verify it matches patched version from your distribution.

📡 Detection & Monitoring

Log Indicators:

Kernel panic logs
NVMe error messages in dmesg
System crash reports

Network Indicators:

Unusual NVMe over TCP connection patterns

SIEM Query:

Search for kernel panic events or NVMe subsystem errors in system logs.

📊 Metadata

CVE ID: CVE-2022-48789

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-416

Published: July 16, 2024

Last Updated: November 21, 2024

🔗 References

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🔗 Related Vulnerabilities

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