# CVE-2026-93082: firmware: arm_scmi: Unwind P2A receiver mailbox setup failure

> A resource leak in the Linux kernel SCMI driver can cause denial of service by leaving mailbox channels busy after setup failures.

- **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:** 17 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-93082, DEBIAN-CVE-2026-93082, GHSA-rp3r-339r-w8rp, UBUNTU-CVE-2026-93082

## What is CVE-2026-93082?

CVE-2026-93082 is a denial of service vulnerability in Linux, published on 17 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:

firmware: arm_scmi: Unwind P2A receiver mailbox setup failure

mailbox_chan_setup() can request an additional P2A receiver channel after
successfully acquiring the primary P2A channel. If that later request
fails, the function returns immediately and leaves the primary channel
allocated.

Unwind the primary mailbox channel before returning the error so probe
deferral or other setup failures do not leave the channel busy for later
probe attempts.

## Which versions are affected by CVE-2026-93082?


## How do I fix CVE-2026-93082?

Apply the vendor's patch.

## Is CVE-2026-93082 being exploited?

There is no known exploitation of CVE-2026-93082 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93082 and fix it if it is affected.

What it is: CVE-2026-93082 is a denial of service vulnerability in Linux, published on 17 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-2026-93082 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-2026-93082/ (Markdown: https://insights.sbomify.com/CVE-2026-93082/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93082
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93082
- OSV: https://osv.dev/vulnerability/CVE-2026-93082

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93082/
Summaries are generated and may contain mistakes; the official description above is the record.