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Fencer Vulns
high 7.1

CVE-2026-26103 json

Udisks: missing authorization check allows unprivileged users to restore luks headers via udisks d-bus api

published 2026-02-25 8 mo ago modified 2026-11-04 4 d ago also EUVD-2026-8634

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:2.10.90-6.el10_1.1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.10.90-5.el10_0.2
  • udisks2 Debian 14 2.11.1-1

debian advisories DEBIAN-CVE-2026-26103

  • udisks2 RHEL 10.1 2.10.90-6.el10_1.1
  • libudisks2 RHEL 10.1 2.10.90-6.el10_1.1
  • udisks2-lsm RHEL 10.1 2.10.90-6.el10_1.1
  • udisks2-lvm2 RHEL 10.1 2.10.90-6.el10_1.1
  • udisks2-iscsi RHEL 10.1 2.10.90-6.el10_1.1
  • udisks2 enterprise linux eus 10.0 2.10.90-5.el10_0.2
  • libudisks2 enterprise linux eus 10.0 2.10.90-5.el10_0.2
  • udisks2-lsm enterprise linux eus 10.0 2.10.90-5.el10_0.2

red hat advisories RHSA-2026:5831RHSA-2026:3476

  • udisks2 openSUSE Tumbleweed 2.11.0-2.1

opensuse advisories openSUSE-SU-2026:10273-1

  • udisks2 AlmaLinux 10 2.10.90-6.el10_1.1.alma.1
  • libudisks2 AlmaLinux 10 2.10.90-6.el10_1.1.alma.1
  • udisks2-lsm AlmaLinux 10 2.10.90-6.el10_1.1.alma.1
  • udisks2-lvm2 AlmaLinux 10 2.10.90-6.el10_1.1.alma.1
  • udisks2-iscsi AlmaLinux 10 2.10.90-6.el10_1.1.alma.1

almalinux advisories ALSA-2026:3476

  • udisks2 Rocky Linux 10 2.10.90-6.el10_1.1

rocky linux advisories RLSA-2026:3476

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-26103 updated cvss 7.1

udisks: Missing Authorization Check Allows Unprivileged Users to Restore LUKS Headers via udisks D-Bus API

  • Red Hat Enterprise Linux AppStream (v. 10) udisks2 2.10.90-6.el10_1.1, libudisks2 2.10.90-6.el10_1.1, udisks2-lsm 2.10.90-6.el10_1.1, udisks2-lvm2 2.10.90-6.el10_1.1, udisks2-iscsi 2.10.90-6.el10_1.1
    fixed: vendor fix RHSA-2026:3476
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) udisks2 2.10.90-5.el10_0.2, libudisks2 2.10.90-5.el10_0.2, udisks2-lsm 2.10.90-5.el10_0.2, udisks2-lvm2 2.10.90-5.el10_0.2, udisks2-iscsi 2.10.90-5.el10_0.2
    fixed: vendor fix RHSA-2026:5831
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libudisks2-devel 2.10.90-6.el10_1.1, udisks2-debuginfo 2.10.90-6.el10_1.1, udisks2-debugsource 2.10.90-6.el10_1.1, libudisks2-debuginfo 2.10.90-6.el10_1.1, udisks2-lsm-debuginfo 2.10.90-6.el10_1.1, udisks2-lvm2-debuginfo 2.10.90-6.el10_1.1, +1 more
    fixed: vendor fix RHSA-2026:3476
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libudisks2-devel 2.10.90-5.el10_0.2, udisks2-debuginfo 2.10.90-5.el10_0.2, udisks2-debugsource 2.10.90-5.el10_0.2, libudisks2-debuginfo 2.10.90-5.el10_0.2, udisks2-lsm-debuginfo 2.10.90-5.el10_0.2, udisks2-lvm2-debuginfo 2.10.90-5.el10_0.2, +1 more
    fixed: vendor fix RHSA-2026:5831
  • Red Hat Enterprise Linux 6 udisks Red Hat Enterprise Linux 7 udisks2, libudisks2, udisks2-lsm, udisks2-lvm2, udisks2-iscsi Red Hat Enterprise Linux 8 udisks2, libudisks2, udisks2-lsm, udisks2-lvm2, udisks2-iscsi Red Hat Enterprise Linux 9 udisks2, libudisks2, udisks2-lsm, udisks2-lvm2, udisks2-iscsi
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.08% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CISA ADP 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.