# CVE-2026-93803: wifi: libipw: fix key index receive bound checks

> A missing bounds check in the Linux kernel libipw WiFi driver allows out-of-bounds reads, potentially causing a denial of service.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Sep 2026
- **Updated:** 3 Oct 2026
- **Also known as:** AZL-103811, BELL-CVE-2026-93803, DEBIAN-CVE-2026-93803, GHSA-7f2h-763g-25cr, UBUNTU-CVE-2026-93803

## What is CVE-2026-93803?

CVE-2026-93803 is a denial of service vulnerability in Linux, published on 24 Sep 2026. 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:

wifi: libipw: fix key index receive bound checks

libipw_rx() reads skb->data[hdrlen + 3] to extract the WEP key index in
both the software-decrypt key selection path and the hardware-decrypted
IV/ICV strip path. In both places the existing guard only checks
skb->len >= hdrlen + 3, which proves bytes up to hdrlen + 2 but not the
byte at hdrlen + 3.

Require hdrlen + 4 bytes before reading that item in both paths. This is
a local source-boundary check only; it does not change the key index
semantics.

## Which versions are affected by CVE-2026-93803?


## How do I fix CVE-2026-93803?

Apply the vendor's patch.

## Is CVE-2026-93803 being exploited?

There is no known exploitation of CVE-2026-93803 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93803 and fix it if it is affected.

What it is: CVE-2026-93803 is a denial of service vulnerability in Linux, published on 24 Sep 2026. 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-2026-93803 in the wild and no public exploit code.

Affected product: 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-2026-93803/ (Markdown: https://insights.sbomify.com/CVE-2026-93803/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93803
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93803
- OSV: https://osv.dev/vulnerability/CVE-2026-93803

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93803/
Summaries are generated and may contain mistakes; the official description above is the record.