# CVE-2025-4382: grub2: A flaw was found in systems utilizing LUKS-encrypted disks with GRUB configured for TPM-based auto-decryption

CVE-2025-4382 is fixed in grub2 on 1 platform, first by DEBIAN-CVE-2025-4382, released May 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-4382
- Priority: Routine
- CVSS: 5.9 (medium)
- EPSS: 0.0035
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 9, 2025

## Description

A flaw was found in systems utilizing LUKS-encrypted disks with GRUB configured for TPM-based auto-decryption. When GRUB is set to automatically decrypt disks using keys stored in the TPM, it reads the decryption key into system memory. If an attacker with physical access can corrupt the underlying filesystem superblock, GRUB will fail to locate a valid filesystem and enter rescue mode. At this point, the disk is already decrypted, and the decryption key remains loaded in system memory. This scenario may allow an attacker with physical access to access the unencrypted data without any further authentication, thereby compromising data confidentiality. Furthermore, the ability to force this state through filesystem corruption also presents a data integrity concern.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | grub2 Debian 14 | 2.14~git20250718.0e36779-2 | [DEBIAN-CVE-2025-4382](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4382.md) | May 9, 2025 |
| Linux | grub2 opensuse-leap 15.6 | 2.12-150600.8.27.1 | [SUSE-SU-2025:01615-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01615-1.md) | May 21, 2025 |
| Linux | grub2 sles 15.6 | 2.12-150600.8.27.1 | [SUSE-SU-2025:01615-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01615-1.md) | May 21, 2025 |
| Linux | grub2 sles 15.7 | 2.12-150700.19.3.1 | [SUSE-SU-2025:01747-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01747-1.md) | May 29, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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