---
id: CVE-2025-4382
title: >-
  A flaw was found in systems utilizing LUKS-encrypted disks with GRUB
  configured for TPM-based auto-decryption
summary: >-
  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. …
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-306
published: '2025-05-09'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-4382'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2025-4382'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2364416'
    label: secalert@redhat.com
  - url: >-
      https://gitweb.git.savannah.gnu.org/gitweb/?p=grub.git;a=blobdiff;f=grub-core/kern/rescue_reader.c;h=a71ada8fb7da2eae6ee7135fe234fb1755ca78b0;hp=4259857ba9eea45446bc40ea13c3de4ab1b88ffd;hb=c448f511e74cb7c776b314fcb7943f98d3f22b6d;hpb=4abac0ad5a7914dd3cdfff08aaac06588bf98d80
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.0037
epssPercentile: 0.30868
ingestedAt: '2026-06-29T13:24:34.203Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.