CVE-2025-38329
📋 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 beyond allocated memory boundaries, potentially exposing sensitive kernel data. It affects Linux systems using the cs_dsp firmware driver.
💻 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/crash.
Likely Case
Information disclosure of kernel memory contents, potentially exposing sensitive data or causing kernel panics in specific conditions.
If Mitigated
Limited impact due to being in a test function, but still represents a kernel memory safety violation.
🎯 Exploit Status
Exploitation requires triggering the specific KUnit test with crafted input, and being in a test environment. Real-world exploitation is limited by being in test code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits 0000a2303ba78b6424ff15b5085b5f5098750a2e and d979b783d61f7f1f95664031b71a33afc74627b2)
Vendor Advisory: https://git.kernel.org/stable/c/0000a2303ba78b6424ff15b5085b5f5098750a2e
Restart Required: Yes
Instructions:
1. Update to a patched kernel version from your distribution. 2. Apply the specific kernel patches if building custom kernel. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable KUnit testing for cs_dsp
linuxDisable the vulnerable KUnit test module if not needed
modprobe -r cs_dsp_test_module
echo 'blacklist cs_dsp_test' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Restrict access to users who could trigger kernel tests
- Monitor for kernel panic logs or unusual memory access patterns
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if cs_dsp KUnit tests are enabled. Use: uname -r and check kernel config for CONFIG_TEST_CS_DSPCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and contains the fix commits. Check: grep -q '0000a2303ba78b6424ff15b5085b5f5098750a2e\|d979b783d61f7f1f95664031b71a33afc74627b2' /proc/version_signature📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- KASAN reports of out-of-bounds access in cs_dsp
- Unexpected kernel test failures
Network Indicators:
- None - this is a local kernel vulnerability
SIEM Query:
source="kernel" AND ("KASAN" OR "out-of-bounds" OR "cs_dsp")