# CVE-2025-38529: comedi: aio_iiro_16: Fix bit shift out of bounds

> A local attacker can trigger an out-of-bounds bit shift in the aio_iiro_16 Comedi driver, potentially causing a kernel crash or arbitrary code execution.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Aug 2025
- **Updated:** 11 May 2026
- **Also known as:** AZL-66396, AZL-73560, BELL-CVE-2025-38529, DEBIAN-CVE-2025-38529, GHSA-jqcq-x2c2-xp7j, ROOT-OS-DEBIAN-11-CVE-2025-38529, ROOT-OS-DEBIAN-12-CVE-2025-38529, ROOT-OS-DEBIAN-13-CVE-2025-38529, ROOT-OS-UBUNTU-2204-CVE-2025-38529, ROOT-OS-UBUNTU-2404-CVE-2025-38529, UBUNTU-CVE-2025-38529

## What is CVE-2025-38529?

CVE-2025-38529 is a high-severity vulnerability in Debian Debian Linux, published on 16 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2025-38529?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2025-38529?

Apply the vendor's patch.

## Is CVE-2025-38529 being exploited?

There is no known exploitation of CVE-2025-38529 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

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- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-38529 and fix it if it is affected.

What it is: CVE-2025-38529 is a high-severity vulnerability in Debian Debian Linux, published on 16 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-38529 in the wild and no public exploit code.

Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-38529/ (Markdown: https://insights.sbomify.com/CVE-2025-38529/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-38529
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-38529
- OSV: https://osv.dev/vulnerability/CVE-2025-38529

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-38529/
Summaries are generated and may contain mistakes; the official description above is the record.