Bug 2433719 (CVE-2026-26103)

Summary:	CVE-2026-26103 udisks: Missing Authorization Check Allows Unprivileged Users to Restore 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:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	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.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2442583, 2442584, 2442585, 2442586
Bug Blocks:
Deadline:	2026-02-25

Description OSIDB Bzimport 2026-01-28 07:59:04 UTC

Missing authorization (polkit) vulnerability in the org.freedesktop.UDisks2.Block.RestoreEncryptedHeader 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_restore_encrypted_header() handler. As a result, any local unprivileged user can invoke this system-bus method and cause the root-privileged udisks daemon to call bd_crypto_luks_header_restore() on an arbitrary block device. This enables destructive overwriting of LUKS headers and keyslots without authentication or user interaction, leading to permanent loss of access to encrypted data and a denial-of-service condition.

Comment 2 errata-xmlrpc 2026-03-02 01:36:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:3476 https://access.redhat.com/errata/RHSA-2026:3476