---
id: CVE-2025-71161
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dm-verity: disable recursive forward error correction

  There are two problems with the recursive correction:

  1
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dm-verity: disable recursive forward error correction

  There are two problems with the recursive correction:

  1. It may cause denial-of-service. In fec_read_bufs, there…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-193
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.5, < 6.18.6'
patched:
  - linux_kernel 6.18.6
published: '2026-01-23'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:18:23.560'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-71161'
references:
  - url: 'https://git.kernel.org/stable/c/232948cf600fba69aff36b25d85ef91a73a35756'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4220cb37406915c926c0e4a3dbab77cd9cceeb1e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/897d9006e75f46f8bd7df78faa424327ae6a4bcf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8b821ca892cfeeaf0bedc9fc72717294f67144d5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d9f3e47d3fae0c101d9094bc956ed24e7a0ee801'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e227d2b229c7529bd98d348efc55262ccf24ab35'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-457936.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00468
epssPercentile: 0.40312
ingestedAt: '2026-09-08T15:33:26.994Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:05:59.236401Z'
---

## Overview

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

dm-verity: disable recursive forward error correction

There are two problems with the recursive correction:

1. It may cause denial-of-service. In fec_read_bufs, there is a loop that
has 253 iterations. For each iteration, we may call verity_hash_for_block
recursively. There is a limit of 4 nested recursions - that means that
there may be at most 253^4 (4 billion) iterations. Red Hat QE team
actually created an image that pushes dm-verity to this limit - and this
image just makes the udev-worker process get stuck in the 'D' state.

2. It doesn't work. In fec_read_bufs we store data into the variable
"fio->bufs", but fio bufs is shared between recursive invocations, if
"verity_hash_for_block" invoked correction recursively, it would
overwrite partially filled fio->bufs.

## Affected

- `linux_kernel >= 4.5, < 6.18.6`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.18.6`