CVE-2025-38317 – A buffer overflow vulnerability exists in the a... (How to Fix)

Q: What is the severity of CVE-2025-38317?

CVE-2025-38317 has a CVSS score of 7.8 (HIGH). A buffer overflow vulnerability exists in the ath12k WiFi driver's debugfs interface in the Linux kernel, allowing root users to write more than 32 bytes and cause memory corruption. This affects Linux systems using the ath12k WiFi driver with debugfs enabled. While limited to root users, it could lead to kernel crashes or potential privilege escalation.

📋 TL;DR

A buffer overflow vulnerability exists in the ath12k WiFi driver's debugfs interface in the Linux kernel, allowing root users to write more than 32 bytes and cause memory corruption. This affects Linux systems using the ath12k WiFi driver with debugfs enabled. While limited to root users, it could lead to kernel crashes or potential privilege escalation.

💻 Affected Systems

Products:

Linux kernel with ath12k WiFi driver

Versions: Linux kernel versions containing vulnerable ath12k driver code before the fix commits

Operating Systems: Linux distributions with vulnerable kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems using the ath12k WiFi driver with debugfs mounted. Debugfs is typically mounted at /sys/kernel/debug and requires root access.

📦 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 →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Root user could exploit this to cause kernel panic, system crash, or potentially execute arbitrary code with kernel privileges leading to complete system compromise.

🟠

Likely Case

Root user accidentally or intentionally writes excessive data causing kernel memory corruption, leading to system instability or crashes.

🟢

If Mitigated

With proper access controls limiting debugfs to trusted administrators only, impact is minimal as exploitation requires root privileges.

🌐 Internet-Facing: LOW - debugfs is typically not exposed to network interfaces and requires local root access.

🏢 Internal Only: MEDIUM - While requiring root access, internal administrators or compromised root accounts could exploit this to destabilize systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: LOW - Simple buffer overflow requiring root access

Exploitation requires root privileges to access debugfs interface. No public exploit code has been identified.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Fixed in kernel commits: 0c57aa8ef94cffc5c2d68230e19329a03e71a94f, 8c4a200d03574bfcbf54fdb7ba5968b58ad2e0b3, 8c7a5031a6b0d42e640fbd2d5d05f61f74e32dce

Vendor Advisory: https://git.kernel.org/stable/c/0c57aa8ef94cffc5c2d68230e19329a03e71a94f

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify ath12k driver is updated.

🔧 Temporary Workarounds

Disable debugfs for ath12k

linux

Unmount debugfs or restrict access to prevent exploitation

umount /sys/kernel/debug
mount -o remount,nodebug /sys/kernel/debug

Restrict debugfs permissions

linux

Change debugfs mount options to restrict access

mount -o remount,noexec,nosuid,nodev /sys/kernel/debug
chmod 700 /sys/kernel/debug

🧯 If You Can't Patch

Restrict root access to systems using ath12k driver
Unmount debugfs filesystem or implement strict access controls

🔍 How to Verify

Check if Vulnerable:

Check if debugfs is mounted and ath12k driver is loaded: lsmod | grep ath12k && mount | grep debugfs

Check Version:

uname -r

Verify Fix Applied:

Check kernel version includes fix commits: uname -r and verify with git log or vendor patch notes

📡 Detection & Monitoring

Log Indicators:

Kernel panic logs
OOM killer messages related to ath12k
System crash dumps

Network Indicators:

None - local vulnerability only

SIEM Query:

source="kernel" AND ("ath12k" OR "debugfs") AND ("panic" OR "corruption" OR "segfault")

📊 Metadata

CVE ID: CVE-2025-38317

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: 0.01% exploit probability (2.2th percentile)

Published: July 10, 2025

Last Updated: November 18, 2025

🔗 References

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