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.
- 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
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
Which versions are affected by CVE-2026-26103?
It affects 2 products.
Products include Freedesktop Udisks, Redhat Enterprise Linux.
How do I fix CVE-2026-26103?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
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
Sources
Also known as DEBIAN-CVE-2026-26103, GHSA-c75h-phf8-ccjm, GHSA-fw7p-cggr-9xm6.