Vulnerability · Published Feb 25, 2026 · Assigned by redhat
CVE-2026-26103Udisks: missing authorization check allows unprivileged users to restore luks headers via udisks d-bus api
High 7.1
In plain English
A high-severity missing authorization in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | libudisks2 | 2.10.90-6.el10_1.1.alma.1 | ALSA-2026:3476 |
| AlmaLinux:10 | libudisks2-devel | 2.10.90-6.el10_1.1.alma.1 | ALSA-2026:3476 |
| AlmaLinux:10 | udisks2 | 2.10.90-6.el10_1.1.alma.1 | ALSA-2026:3476 |
| AlmaLinux:10 | udisks2-iscsi | 2.10.90-6.el10_1.1.alma.1 | ALSA-2026:3476 |
| AlmaLinux:10 | udisks2-lsm | 2.10.90-6.el10_1.1.alma.1 | ALSA-2026:3476 |
| AlmaLinux:10 | udisks2-lvm2 | 2.10.90-6.el10_1.1.alma.1 | ALSA-2026:3476 |
| Debian:14 | udisks2 | 2.11.1-1 | DEBIAN-CVE-2026-26103 |
| Rocky Linux:10 | udisks2 | 0:2.10.90-6.el10_1.1 | RLSA-2026:3476 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
References
- RHSA-2026:3476 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:5831 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-26103 vdb-entry, x_refsource_REDHAT
- RHBZ#2433719 issue-tracking, x_refsource_REDHAT
- https://github.com/storaged-project/udisks/security/advisories/GHSA-c75h-phf8-ccjm
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26103.json x_sadp-csaf-vex