# CVE-2026-89531: svcrdma: Reject connection when transport allocation fails

> A remote attacker can cause a denial of service by triggering memory allocation failures in the Linux kernel's svcrdma module, leading to resource leaks.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 11 Sep 2026
- **Updated:** 21 Oct 2026
- **Also known as:** AZL-100640, BELL-CVE-2026-89531, DEBIAN-CVE-2026-89531, GHSA-vgrv-wfr9-vqh2, UBUNTU-CVE-2026-89531

## What is CVE-2026-89531?

CVE-2026-89531 is a denial of service vulnerability in Linux, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

svcrdma: Reject connection when transport allocation fails

handle_connect_req() returns without action when
svc_rdma_create_xprt() fails to allocate the new transport.
The CM core returns 0 for CONNECT_REQUEST events, so it does
not destroy the new rdma_cm_id. Each allocation failure under
memory pressure leaks one rdma_cm_id, and a remote peer driving
connection attempts can amplify this.

Reject the connection by returning a non-zero status from the
CM event handler, which tells the CM core to destroy the
orphaned cm_id.

## Which versions are affected by CVE-2026-89531?


## How do I fix CVE-2026-89531?

Apply the vendor's patch.

## Is CVE-2026-89531 being exploited?

There is no known exploitation of CVE-2026-89531 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89531 and fix it if it is affected.

What it is: CVE-2026-89531 is a denial of service vulnerability in Linux, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-89531 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-2026-89531/ (Markdown: https://insights.sbomify.com/CVE-2026-89531/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89531
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89531
- OSV: https://osv.dev/vulnerability/CVE-2026-89531

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89531/
Summaries are generated and may contain mistakes; the official description above is the record.