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Udisks CVE-2026-26103

HIGH
Missing Authorization (CWE-862)
2026-02-25 secalert@redhat.com
Authentication Bypass Red Hat Enterprise Linux Udisks Freedesktop
7.1
CVSS 3.1 · Vendor: redhat
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Local user connects to D-Bus socket
  2. Delivery
    Call privileged udisks RestoreEncryptionHeader API
  3. Exploit
    Daemon overwrites LUKS metadata without authorization
  4. Execution
    Encryption keys invalidated permanently
  5. Impact
    Volume becomes inaccessible

Vulnerability Assessment

Weakness
CWE
CWE-862
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization checks on every request
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

Local system access required. Unprivileged user account with D-Bus session access. udisks daemon running with root privileges. LUKS-encrypted block device present on system with restorable encryption header metadata.
Impact

CVSS 7.1 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via local access.
Exploit ScenarioDerived

An attacker could exploit this flaw, a denial-of-service condition through irreversible data loss.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Improper authorization in the udisks D-Bus API allows local unprivileged users to manipulate LUKS encryption headers on block devices with root privileges, potentially destroying encryption keys and rendering volumes inaccessible. An attacker with local access can exploit this to cause permanent data loss through denial-of-service. No patch is currently available for this vulnerability.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:55 CVSS 7.1

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. [CVSS 7.1 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

Classified as CWE-862 (Missing Authorization). Affects Enterprise Linux. 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.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (redhat) PRIMARY 7.1 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
SUSE HIGH
Red Hat 7.1 HIGH

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

Lifecycle Timeline

2
Patch released
Apr 10, 2026 - 08:30 nvd
Patch available
CVE Published
Feb 25, 2026 - 11:16 nvd
HIGH 7.1

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

A critical flaw in the udisks daemon allows attackers to bypass encryption protections on storage devices through an unprotected system interface, potentially exposing sensitive data on affected servers and workstations. This vulnerability is particularly concerning because no patch is currently available, requiring immediate interim protective measures to prevent unauthorized access to encrypted storage.

Business Impact: High
Compensating Controls

Restrict D-Bus system bus access through PolicyKit authorization policies; disable udisks service where operationally feasible; implement network segmentation to limit local access; apply SELinux or AppArmor mandatory access controls to restrict privileged D-Bus operations; monitor for udisks process activity and D-Bus method calls; consider running storage management functions in isolated virtual machines with limited D-Bus exposure.

Threat Intelligence Overview

EPSS Score
0.0%
Top 99% exploitable
Data Quality
6 sources
Confidence: High
NVD CVE.org EPSS Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
High

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:a:freedesktop:udisks:2.0.0:*:*:*:*:*:*:*

More in Udisks

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CVE-2018-17336 HIGH POC
7.8 Sep 22

UDisks 2.8.0 has a format string vulnerability in udisks_log in udiskslogging.c, allowing attackers to obtain sensitive

CVE-2021-3802 MEDIUM POC
4.2 Nov 29

A vulnerability found in udisks2. Rated medium severity (CVSS 4.2), this vulnerability is low attack complexity. Public

CVE-2014-0004 MEDIUM
6.9 Mar 11

Stack-based buffer overflow in udisks before 1.0.5 and 2.x before 2.1.3 allows local users to cause a denial of service

CVE-2026-26104 MEDIUM
5.5 Feb 25

Unprivileged users can extract LUKS encryption headers from the udisks daemon due to missing authorization checks on a p

Same weakness CWE-862 – Missing Authorization

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

References

Advisories & patches
ADVISORY https://access.redhat.com/security/cve/CVE-2026-26103 ADVISORY https://bugzilla.redhat.com/show_bug.cgi?id=2433719 ADVISORY https://vuldb.com/?id.347756 REF https://access.redhat.com/errata/RHSA-2026:3476 REF https://access.redhat.com/errata/RHSA-2026:5831 REF https://github.com/storaged-project/udisks/security/advisories/GHSA-c75h-phf8-ccjm REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26103.json

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