Bug 2433717 (CVE-2026-26104)

Summary:	CVE-2026-26104 udisks: Missing Authorization Check Allows Unprivileged Users to Back Up LUKS Headers via udisks D-Bus API
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	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.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2442587, 2442588
Bug Blocks:
Deadline:	2026-02-25

Description OSIDB Bzimport 2026-01-28 07:49:25 UTC

Missing authorization (polkit) vulnerability in the org.freedesktop.UDisks2.Encrypted.HeaderBackup D-Bus method of udisks. The flaw is caused by the absence of a call to udisks_daemon_util_check_authorization_sync() in the handle_header_backup() handler. An unprivileged local user can invoke this system-bus method to cause the root-owned udisks daemon to call bd_crypto_luks_header_backup() and export LUKS headers and keyslot metadata to an arbitrary file path. This allows unauthorized disclosure of sensitive cryptographic material without authentication or user interaction.