# CVE-2026-26103: Udisks: missing authorization check allows unprivileged users to restore luks headers via udisks d-bus api

> Unprivileged local users can exploit missing authorization in udisks to overwrite LUKS headers, causing permanent data loss and denial of service.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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:** 25 Feb 2026
- **Updated:** 15 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-26103, GHSA-c75h-phf8-ccjm, GHSA-fw7p-cggr-9xm6

## What is CVE-2026-26103?

CVE-2026-26103 is a high-severity missing authorization vulnerability in Redhat Enterprise Linux, published on 25 Feb 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 the udisks storage management daemon that exposes a privileged D-Bus API for restoring LUKS encryption headers without proper authorization checks. The issue allows a local unprivileged user to instruct the root-owned udisks daemon to overwrite encryption metadata on block devices. This can permanently invalidate encryption keys and render encrypted volumes inaccessible. Successful exploitation results in a denial-of-service condition through irreversible data loss.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-26103?

It affects 2 products.


Products: Freedesktop Udisks, Redhat Enterprise Linux.

## How do I fix CVE-2026-26103?

Apply the vendor's patch.

## Is CVE-2026-26103 being exploited?

There is no known exploitation of CVE-2026-26103 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2026-26104](https://insights.sbomify.com/CVE-2026-26104/): Udisks: missing authorization check allows unprivileged users to back up luks headers via udisks d-bus api (medium 5.5)
- [CVE-2010-1149](https://insights.sbomify.com/CVE-2010-1149/): Information disclosure in n/a (low 2.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26103 and fix it if it is affected.

What it is: CVE-2026-26103 is a high-severity missing authorization vulnerability in Redhat Enterprise Linux, published on 25 Feb 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-2026-26103 in the wild and no public exploit code.

Affected product: Redhat Enterprise 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-2026-26103/ (Markdown: https://insights.sbomify.com/CVE-2026-26103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26103
- OSV: https://osv.dev/vulnerability/CVE-2026-26103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-26103/
Summaries are generated and may contain mistakes; the official description above is the record.