CVE-2025-38629
📋 TL;DR
This CVE describes a NULL pointer dereference vulnerability in the Linux kernel's ALSA USB driver for Scarlett2 audio interfaces. If exploited, it could cause a kernel panic (system crash) or potentially lead to privilege escalation. This affects Linux systems using the affected ALSA driver with Scarlett2 USB audio devices.
💻 Affected Systems
- Linux kernel
📦 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
Kernel panic leading to system crash and denial of service, or potential privilege escalation if combined with other vulnerabilities.
Likely Case
System crash or instability when specific USB audio operations are performed with Scarlett2 devices.
If Mitigated
No impact if the vulnerable driver is not loaded or Scarlett2 devices are not used.
🎯 Exploit Status
Requires local access and specific USB audio operations; not trivial to exploit remotely
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 2c735fcaee81ad8056960659dc9dc460891e76b0, d558db85920b124bac36f8a7ddc5de0aa7491bdd, or df485a4b2b3ee5b35c80f990beb554e38a8a5fb1
Vendor Advisory: https://git.kernel.org/stable/c/2c735fcaee81ad8056960659dc9dc460891e76b0
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 scarlett2 driver
linuxPrevent loading of the vulnerable driver module
echo 'blacklist snd-usb-scarlett2' >> /etc/modprobe.d/blacklist-scarlett2.conf
rmmod snd-usb-scarlett2
Avoid Scarlett2 USB devices
allDo not connect Focusrite Scarlett2 USB audio interfaces to vulnerable systems
🧯 If You Can't Patch
- Restrict physical and USB access to prevent connection of Scarlett2 devices
- Implement strict user privilege controls to limit who can perform audio operations
🔍 How to Verify
Check if Vulnerable:
Check if scarlett2 driver is loaded: lsmod | grep scarlett2. If loaded and kernel version is unpatched, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Check kernel version is patched and scarlett2 driver loads without issues when Scarlett2 device is connected.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages in /var/log/kern.log or dmesg
- System crash/panic logs when USB audio operations occur
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("Oops" OR "NULL pointer dereference" OR "scarlett2")