---
id: CVE-2026-46023
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dm mirror: fix integer overflow in create_dirty_log()

  The argument count calculation in create_dirty_log() performs
  `*args_used = 2 + param_count` before validating ag…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dm mirror: fix integer overflow in create_dirty_log()

  The argument count calculation in create_dirty_log() performs
  `*args_used = 2 + param_count` before validating ag…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.12.1, < 5.10.258'
  - 'linux_kernel >= 5.11, < 5.15.209'
  - 'linux_kernel >= 5.16, < 6.1.175'
  - 'linux_kernel >= 6.2, < 6.6.140'
  - 'linux_kernel >= 6.7, < 6.12.86'
  - 'linux_kernel >= 6.13, < 6.18.27'
  - 'linux_kernel >= 6.19, < 7.0.4'
  - linux_kernel = 2.6.12
patched:
  - linux_kernel 7.0.4
published: '2026-05-27'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:19:38.927'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46023'
references:
  - url: 'https://git.kernel.org/stable/c/17a08791d428885d00e510864283a7b839792368'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/249c831183fb806c8e3b14c7c4c1d2fb68cf37fb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/35f6b3281efd44d19110574663bc17a610bc73b9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/47dad9eea75d33212d3d2cea10e7ed6a1bfc0713'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4c788c6f921b22f9b6c3f316c4a071c05683e7de'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/87c99a50e0fdc68a5b9b52a94d49452cd3ff02ca'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae59b3025609d5a0a39cf5b2b94e2467f6231573'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e5e0ae3237584ebef510366c4cb3d5cc7c22b610'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00173
epssPercentile: 0.06246
ingestedAt: '2026-10-15T03:30:12.881Z'
---

## Overview

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

dm mirror: fix integer overflow in create_dirty_log()

The argument count calculation in create_dirty_log() performs
`*args_used = 2 + param_count` before validating against argc. When a
user provides a param_count close to UINT_MAX via the device mapper
table string, this unsigned addition wraps around to a small value,
causing the subsequent `argc < *args_used` check to be bypassed.

The overflowed param_count is then passed as argc to dm_dirty_log_create(),
where it can cause out-of-bounds reads on the argv array.

Fix by comparing param_count against argc - 2 before performing the
addition, following the same pattern used by parse_features() in the
same file. Since argc >= 2 is already guaranteed, the subtraction is
safe.

## Affected

- `linux_kernel >= 2.6.12.1, < 5.10.258`
- `linux_kernel >= 5.11, < 5.15.209`
- `linux_kernel >= 5.16, < 6.1.175`
- `linux_kernel >= 6.2, < 6.6.140`
- `linux_kernel >= 6.7, < 6.12.86`
- `linux_kernel >= 6.13, < 6.18.27`
- `linux_kernel >= 6.19, < 7.0.4`
- `linux_kernel = 2.6.12`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.4`