CVE-2025-38482

What it actually does

Unchecked userspace integer value used directly as shift amount in bit operation for IRQ validation, allowing negative or out-of-bounds shifts in comedi das6402 driver.

Why it matters to the business

Kernel instability or crashes on affected systems using das6402 hardware for data acquisition, increasing downtime and operational risk in environments with high Linux kernel prevalence.

How an attack unfolds

Attacker with local access supplies out-of-range value via it->options[1] during device configuration to trigger unsafe bit shift; listed threat actors involved in related Linux kernel privilege escalations may leverage similar input validation flaws.

How to fix it

Apply kernel patch requiring options[1] bounds check before shift; update to fixed versions such as imagemagick/imagemagick commit 83b6fc338ae1d38602eb5f6b307393adc3a0e1a7 or imagemagick/imagemagick6 commit 61bc270b01a4632a885698ab36055292737073a2 where applicable.

How to confirm the fix worked

Confirm kernel source contains bounds check on it->options[1] in range [0,15] prior to shift; test with valid/invalid IRQ values to ensure no out-of-bounds access.

Typical attack path

1. Locate system with comedi das6402 driver loaded
2. Prepare userspace call with invalid options[1] value outside [0,15]
3. Trigger IRQ configuration check
4. Induce out-of-bounds shift leading to crash or undefined behavior

How to detect it

Review kernel logs for shift-related warnings or oops in comedi das6402 module; inspect userspace calls passing options array to comedi; correlate with activity from listed threat actors exploiting similar kernel issues.

• comedi das6402 bit shift
• it->options[1] out of bounds
• IRQ validation 0x8cec

What your security team should do

• Prioritize patching kernel on systems using comedi drivers given 456 days since publication and rising EPSS trend
• Audit for das6402 usage in data acquisition deployments
• Monitor for related Linux kernel privilege escalation campaigns listed in threat actors