Auth bypass in Freedesktop Udisks
CVE-2026-26104
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 class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (0.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Freedesktop Udisks — versions 2.0.0
- Red Hat Enterprise Linux 10 — versions 0:2.10.90-6.el10_1.1
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:2.10.90-5.el10_0.2
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux — versions 10.0
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:3476 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:5831 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2026-26104 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- github.com/storaged-project/udisks/security/advisories/GHSA-fcvx-497g-6xmw
Frequently asked questions
- What is CVE-2026-26104?
- CVE-2026-26104 is a medium-severity vulnerability in Freedesktop Udisks, classified under Missing Authorization. CVSS score: 5.5/10. Published 2026-02-25.
- How severe is CVE-2026-26104?
- Medium severity. CVSS v3 base score is 5.5 out of 10.