CVE-2022-48801 – A use-after-free vulnerability in the Linux ker... (How to Fix)

Q: What is the severity of CVE-2022-48801?

CVE-2022-48801 has a CVSS score of 7.8 (HIGH). A use-after-free vulnerability in the Linux kernel's IIO (Industrial I/O) subsystem allows local attackers to potentially escalate privileges or crash the system. The flaw occurs when error handling fails to properly clean up file descriptors after fd_install(), leaving dangling pointers. This affects systems using the IIO subsystem with the vulnerable ioctl handler.

📋 TL;DR

A use-after-free vulnerability in the Linux kernel's IIO (Industrial I/O) subsystem allows local attackers to potentially escalate privileges or crash the system. The flaw occurs when error handling fails to properly clean up file descriptors after fd_install(), leaving dangling pointers. This affects systems using the IIO subsystem with the vulnerable ioctl handler.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific vulnerable versions not explicitly stated in CVE, but references indicate stable kernel patches

Operating Systems: Linux distributions using vulnerable kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Requires CONFIG_IIO=y and access to IIO device files. Not all systems use IIO subsystem.

📦 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

Local privilege escalation to root, complete system compromise, or kernel panic causing denial of service.

🟠

Likely Case

Local privilege escalation allowing attackers to gain elevated permissions on the system.

🟢

If Mitigated

Limited impact if proper access controls restrict local user access and IIO subsystem usage.

🌐 Internet-Facing: LOW - Requires local access to exploit, not directly reachable from network.

🏢 Internal Only: MEDIUM - Local attackers or compromised user accounts could exploit this for privilege escalation.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local access and knowledge of IIO subsystem. Use-after-free exploitation requires precise timing and memory manipulation.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions with commits: 202071d2518537866d291aa7cf26af54e674f4d4, b7f54894aa7517d2b6c797a499b9f491e9db9083, c72ea20503610a4a7ba26c769357d31602769c01

Vendor Advisory: https://git.kernel.org/stable/c/202071d2518537866d291aa7cf26af54e674f4d4

Restart Required: Yes

Instructions:

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

🔧 Temporary Workarounds

Disable IIO subsystem

linux

Remove IIO kernel module if not needed

rmmod iio
echo 'blacklist iio' >> /etc/modprobe.d/blacklist.conf

Restrict access to IIO device files

linux

Limit access to /dev/iio:* devices to trusted users only

chmod 600 /dev/iio:*
chown root:root /dev/iio:*

🧯 If You Can't Patch

Implement strict access controls to limit local user privileges
Monitor for suspicious IIO subsystem usage and privilege escalation attempts

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if IIO subsystem is loaded: lsmod | grep iio

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes the fix commits or check with distribution's security update status

📡 Detection & Monitoring

Log Indicators:

Kernel oops messages
Failed IIO ioctl operations
Unexpected privilege escalation

Network Indicators:

None - local exploit only

SIEM Query:

Process monitoring for unexpected access to /dev/iio devices or privilege escalation patterns

📊 Metadata

CVE ID: CVE-2022-48801

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: September 24, 2025

🔗 References

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🔗 Related Vulnerabilities

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