CVE-2025-38340
📋 TL;DR
This CVE describes an out-of-bounds memory read vulnerability in the Linux kernel's cs_dsp firmware component, specifically in a KUnit test function. The vulnerability allows reading memory beyond allocated boundaries, potentially exposing sensitive kernel data. It affects Linux systems using the cs_dsp firmware component.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory disclosure leading to information leakage, potential privilege escalation if combined with other vulnerabilities, or system instability/crashes.
Likely Case
Information disclosure of kernel memory contents, potentially exposing sensitive data or causing system instability.
If Mitigated
Limited impact due to being in test code, but still represents a kernel memory safety issue.
🎯 Exploit Status
Exploitation requires local access and kernel privileges; being in test code may limit real-world impact
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits 8f4cc454a0bb45b800bc7817c09c8f72e31901f3 and fe6446215bfad11cf3b446f38b28dc7708973c25)
Vendor Advisory: https://git.kernel.org/stable/c/8f4cc454a0bb45b800bc7817c09c8f72e31901f3
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from official kernel.org or distribution repositories. 2. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable KUnit testing
linuxDisable KUnit test execution for cs_dsp component if possible
echo 0 > /sys/kernel/debug/kunit/enable
🧯 If You Can't Patch
- Restrict local user access to systems
- Implement strict privilege separation and limit kernel module loading
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if cs_dsp KUnit tests are present and vulnerableCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or is newer than patched versions📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- KASAN out-of-bounds access reports
- System instability logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for kernel panic events or KASAN reports related to cs_dsp or out-of-bounds memory access