CVE-2021-3802: A vulnerability found in udisks2

Q: How do I fix CVE-2021-3802?

udisks: upgrade to 2.9.4; fedora: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-3802 being exploited?

CVE-2021-3802 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-3802 affect?

CVE-2021-3802 affects udisks, fedora, enterprise linux. Severity is medium (CVSS 4.2). A vulnerability found in udisks2. This flaw allows an attacker to input a specially crafted image file/USB leading to kernel panic. The highest threat from this vulnerability is to system availability.

Q: How urgent is CVE-2021-3802?

Priority 40/100. Public exploit reference; On your watchlist

This month

MEDIUM 4.2WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2021-3802 is a medium-severity flaw (CVSS 4.2) affecting udisks, fedora, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability found in udisks2. This flaw allows an attacker to input a specially crafted image file/USB leading to kernel panic. The highest threat from this vulnerability is to system availability.

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-11-29
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · redhat · udisks project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-29 16:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

udisks project udisks UPGRADE

Affected: < 2.9.4

Fixed in: 2.9.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.9.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade udisks

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade udisks

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 34

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

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.

redhat enterprise linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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.

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-2021-3802?

udisks: upgrade to 2.9.4; fedora: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3802 being exploited?

CVE-2021-3802 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-2021-3802 affect?

CVE-2021-3802 affects udisks, fedora, enterprise linux. Severity is medium (CVSS 4.2). A vulnerability found in udisks2. This flaw allows an attacker to input a specially crafted image file/USB leading to kernel panic. The highest threat from this vulnerability is to system availability.

How urgent is CVE-2021-3802?

Priority 40/100. Public exploit reference; On your watchlist

Related CVEs

CVE-2026-26103 HIGH 7.1 MITIGATE DOWNGRADE A flaw was found in the udisks storage management daemon that exposes a privileged D-Bus API for restoring LUK
CVE-2026-26104 MEDIUM 5.5 MITIGATE DOWNGRADE A flaw was found in the udisks storage management daemon that allows unprivileged users to back up LUKS encryp

References

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