# CVE-2025-38529: comedi: aio\_iiro\_16: Fix bit shift out of bounds

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-08-16 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.0

## Description

In the Linux kernel, the following vulnerability has been resolved: comedi: aio_iiro_16: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: if ((1 << it->options[1]) & 0xdcfc) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/a88692245c315bf8e225f205297a6f4b13d6856a
- https://git.kernel.org/stable/c/5ac7c60439236fb691b8c7987390e2327bbf18fa
- https://git.kernel.org/stable/c/c593215385f0c0163015cca4512ed3ff42875d19
- https://git.kernel.org/stable/c/ff30dd3f15f443d2a0085b12ec2cc95d44f35fa7
- https://git.kernel.org/stable/c/955e8835855fed8e87f7d8c8075564a1746c1b4c
- https://git.kernel.org/stable/c/e0f3c0867d7d231c70984f05c97752caacd0daba
- https://git.kernel.org/stable/c/43ddd82e6a91913cea1c078e782afd8de60c3a53
- https://git.kernel.org/stable/c/66acb1586737a22dd7b78abc63213b1bcaa100e4

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Page: https://cve.now/CVE-2025-38529
JSON: https://cve.now/api/v1/entries/CVE-2025-38529
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