edgelesssys constellation up to 2.23.x libcryptsetup crypt_activate_by_passhrase signature verification

Summaryinfo

A vulnerability was found in edgelesssys constellation up to 2.23.x and classified as problematic. This issue affects the function crypt_activate_by_passhrase of the component libcryptsetup. The manipulation results in signature verification. This vulnerability is known as CVE-2025-58356. Attacking locally is a requirement. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in edgelesssys constellation up to 2.23.x. It has been classified as problematic. Affected is the function crypt_activate_by_passhrase of the component libcryptsetup. The manipulation with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-58356 since 08/29/2025. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation requires an enhanced level of successful authentication. There are known technical details, but no exploit is available.

Upgrading to version 2.24.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• edgelesssys

Name

• constellation

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23

Website

• Product: https://github.com/edgelesssys/constellation/

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