CVE-2021-4122

cryptsetup: disable encryption via header rewrite

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Severity

Moderate

Red Hat Product Security

5.9

CVSS 3.1

Review impact separately from score.

Published · January 13, 2022

Updated · October 14, 2026

Description

It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device. An attacker with physical access to the medium, such as a flash disk, could use this flaw to force a user into permanently disabling the encryption layer of that medium.

Statement

Red Hat Enterprise Linux version 7 and older are not affected since they do not support online reencryption.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.9
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE-349 · Acceptance of Extraneous Untrusted Data With Trusted Data