Auth bypass in Freedesktop Udisks
CVE-2026-26103
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (1.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.0% 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-2026-26103 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- github.com/storaged-project/udisks/security/advisories/GHSA-c75h-phf8-ccjm
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-26103?
- CVE-2026-26103 is a high-severity vulnerability in Freedesktop Udisks, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-02-25.
- How severe is CVE-2026-26103?
- High severity. CVSS v3 base score is 7.1 out of 10.