udisks Unprivileged LUKS Header Backup via D-Bus Policy Check Bypass
CVE-2026-26104 Published on February 25, 2026
Udisks: missing authorization check allows unprivileged users to back up luks headers via udisks d-bus api
A flaw was found in the udisks storage management daemon that allows unprivileged users to back up LUKS encryption headers without authorization. The issue occurs because a privileged D-Bus method responsible for exporting encryption metadata does not perform a policy check. As a result, sensitive cryptographic metadata can be read and written to attacker-controlled locations. This weakens the confidentiality guarantees of encrypted storage volumes.
Vulnerability Analysis
CVE-2026-26104 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Timeline
Reported to Red Hat.
Made public. 28 days later.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-26104 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-26104
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