CVE-2024-41038

What it actually does

Missing bounds checks on variable-length string fields in V2 algorithm headers allow a buffer overrun when parsing firmware data into the cs_dsp structure.

Why it matters to the business

Systems running affected Linux kernels may experience crashes or denial of service when loading specially crafted firmware, increasing operational risk for devices that rely on Cirrus Logic DSP firmware.

How an attack unfolds

An attacker with local access supplies a malicious wmfw V2 firmware image containing oversized or malformed algorithm headers; the kernel parser reads beyond the allocated buffer, triggering memory corruption that can be leveraged for denial of service.

How to fix it

Update the Linux kernel to commit 6619aa48a011364e9f29083cc76368e6acfe5b11 or later stable releases that contain the bounds checks for V2 algorithm headers.

How to confirm the fix worked

Verify the running kernel contains commit 6619aa48a011364e9f29083cc76368e6acfe5b11; attempt to load a V2 firmware image and confirm no buffer-overrun warnings or crashes occur in the cs_dsp code path.

Typical attack path

1. Obtain local code execution or user privileges on a Linux system using the vulnerable cs_dsp driver
2. Prepare a crafted V2 firmware file with algorithm header fields that exceed the remaining buffer length
3. Trigger firmware loading through the DSP device interface or driver initialization
4. Cause the kernel to process the header without length validation, resulting in buffer overrun

How to detect it

Review kernel logs (dmesg, syslog) for cs_dsp or wmfw firmware parsing messages around device load times; look for unexpected crashes or oops reports during firmware initialization after loading third-party firmware.

What your security team should do

• Apply the referenced kernel commit or upgrade to a fixed distribution kernel immediately on all affected systems
• Restrict untrusted firmware loading to privileged contexts only until patches are deployed
• Monitor kernel logs for cs_dsp firmware parsing errors during device initialization