---
id: CVE-2025-68251
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  erofs: avoid infinite loops due to corrupted subpage compact indexes

  Robert reported an infinite loop observed by two crafted images.

  The root cause is that `clustero…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  erofs: avoid infinite loops due to corrupted subpage compact indexes

  Robert reported an infinite loop observed by two crafted images.

  The root cause is that `clustero…
severity: none
published: '2025-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68251'
references:
  - url: 'https://git.kernel.org/stable/c/8675447a8794983f2b7e694b378112772c17635e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dbfac1b85d0753996ddfef636934d431b588dd1f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e13d315ae077bb7c3c6027cc292401bc0f4ec683'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00185
epssPercentile: 0.07542
ingestedAt: '2026-10-14T13:30:58.467Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

erofs: avoid infinite loops due to corrupted subpage compact indexes

Robert reported an infinite loop observed by two crafted images.

The root cause is that `clusterofs` can be larger than `lclustersize`
for !NONHEAD `lclusters` in corrupted subpage compact indexes, e.g.:

  blocksize = lclustersize = 512   lcn = 6   clusterofs = 515

Move the corresponding check for full compress indexes to
`z_erofs_load_lcluster_from_disk()` to also cover subpage compact
compress indexes.

It also fixes the position of `m->type >= Z_EROFS_LCLUSTER_TYPE_MAX`
check, since it should be placed right after
`z_erofs_load_{compact,full}_lcluster()`.

## Remediation

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