# CVE-2026-89098: Nfs-utils: nfs-utils: denial of service via assertion failure in fsidd

> A local user can crash the fsidd daemon by sending malformed requests, causing a denial of service for filesystem identifier lookups.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-109794, BELL-CVE-2026-89098, DEBIAN-CVE-2026-89098, ECHO-813c-68f6-1e57, GHSA-7q29-687q-4m44, UBUNTU-CVE-2026-89098

## What is CVE-2026-89098?

CVE-2026-89098 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 16 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in nfs-utils. The fsidd daemon improperly handles input received over its local domain socket by relying on program assertions to verify command arguments. A local user can exploit this vulnerability by sending a malformed request lacking the required arguments to trigger an assertion failure. This causes the daemon to crash, resulting in a Denial of Service (DoS) for filesystem identifier lookup services until restarted.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2026-89098?


## How do I fix CVE-2026-89098?

Apply the vendor's patch.

## Is CVE-2026-89098 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89098 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89098 and fix it if it is affected.

What it is: CVE-2026-89098 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 16 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89098 exists.

Affected product: Red Hat Enterprise Linux 10. 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-2026-89098/ (Markdown: https://insights.sbomify.com/CVE-2026-89098/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89098
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89098
- OSV: https://osv.dev/vulnerability/CVE-2026-89098

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89098/
Summaries are generated and may contain mistakes; the official description above is the record.