CVE-2026-26103: A flaw was found in the udisks storage management daemon that exposes a privileged D-Bus API for restoring LUK

Routine

HIGH 7.1WATCHLISTMITIGATEDOWNGRADE

CVE-2026-26103 is a high-severity flaw (CVSS 7.1) affecting enterprise linux, udisks. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 c

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 100%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-02-25
Last modified	2026-07-15

Publisher (CNA): Red Hat, Inc. · Vendor: freedesktop · redhat

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-25 11:16 UTCPublished CVE record published
2026-07-15 02:18 UTCUpdated Record last modified

redhat enterprise linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

freedesktop udisks DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy udisks || rpm -q udisks || udisks --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison udisks sudo apt install udisks=<VERSION_BEFORE_2.0.0> sudo apt-mark hold udisks

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list udisks sudo dnf downgrade udisks-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add udisks

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26103?

enterprise linux: mitigate or apply the listed mitigation; udisks: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-26103 being exploited?

CVE-2026-26103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26103 affect?

CVE-2026-26103 affects enterprise linux, udisks. Severity is high (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. The issue allows a local unprivileged user to instruct the root-owned ud

How urgent is CVE-2026-26103?

Priority 30/100. High severity; On your watchlist

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References

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