# CVE-2025-38483: comedi: das16m1: Fix bit shift out of bounds

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-07-28 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.14

## Description

In the Linux kernel, the following vulnerability has been resolved: comedi: das16m1: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: /* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */ 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.

## 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/539bdff832adac9ea653859fa0b6bc62e743329c
- https://git.kernel.org/stable/c/d1291c69f46d6572b2cf75960dd8975d7ab2176b
- https://git.kernel.org/stable/c/b3c95fa508e5dc3da60520eea92a5241095ceef1
- https://git.kernel.org/stable/c/65c03e6fc524eb2868abedffd8a4613d78abc288
- https://git.kernel.org/stable/c/adb7df8a8f9d788423e161b779764527dd3ec2d0
- https://git.kernel.org/stable/c/076b13ee60eb01ed0d140ef261f95534562a3077
- https://git.kernel.org/stable/c/f211572818ed5bec2b3f5d4e0719ef8699b3c269
- https://git.kernel.org/stable/c/ed93c6f68a3be06e4e0c331c6e751f462dee3932

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Page: https://cve.now/CVE-2025-38483
JSON: https://cve.now/api/v1/entries/CVE-2025-38483
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