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CVE-2025-58356

Constellation allows insecure use of LUKS2 persistent storage partitions

HIGH
8.3
CVSS Score
Published: October 27, 2025 at 07:33 PM UTC
Updated: October 8, 2026 at 11:10 AM UTC
1 product affected across 1 vendorConstellation

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Severity
HIGH8.3
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

Constellation is the first Confidential Kubernetes. The Constellation CVM image uses LUKS2-encrypted volumes for persistent storage. When opening an encrypted storage device, the CVM uses the libcryptsetup function crypt_activate_by_passhrase. If the VM is successful in opening the partition with the disk encryption key, it treats the volume as confidential. However, due to the unsafe handling of null keyslot algorithms in the cryptsetup 2.8.1, it is possible that the opened volume is not encrypted at all. Cryptsetup prior to version 2.8.1 does not report an error when processing LUKS2-formatted disks that use the cipher_null-ecb algorithm in the keyslot encryption field. This vulnerability is fixed in 2.24.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Constellation· Edgelesssys
90%
v < 2.24.0
Affected range stops below 2.24.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/edgelesssys/constellation/security/advisories/GHSA-hq76-6gh2-5g4q
x_refsource_MISC
Source: cverecord
https://github.com/edgelesssys/constellation/pull/3927
x_refsource_MISC
Source: cverecord
https://github.com/edgelesssys/constellation/releases/tag/v2.24.0
Source: af854a3a-2127-422b-91ae-364da2661108
https://blog.trailofbits.com/2025/10/30/vulnerabilities-in-luks2-disk-encryption-for-confidential-vms/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.3HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-347

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