---
id: CVE-2026-89578
title: >-
  kernel: dm-io: clone the source bio instead of copying its biovec
  (CVE-2026-89578)
summary: >-
  A flaw was found in the Linux kernel's device mapper I/O (dm-io) component.
  When handling DM_IO_BIO requests, incorrect sector-based accounting for
  misaligned direct I/O buffers could lead to an infinite loop. This issue can
  cause I/O oper…
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'
cvssSource: vendor
cwe: CWE-835
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T17:54:50+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89578'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532204'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89578'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89578'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89578.mbox
  - url: 'https://git.kernel.org/stable/c/62dc37a819a5a5de5cba989ad9e96ee214b9253e'
  - url: 'https://git.kernel.org/stable/c/8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c'
  - url: 'https://git.kernel.org/stable/c/9493ac67623d45b7d4671d2b0b4d0633c2bc2e51'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00206
epssPercentile: 0.09635
ingestedAt: '2026-09-14T11:11:19.886Z'
---

## Overview

A flaw was found in the Linux kernel's device mapper I/O (dm-io) component. When handling DM_IO_BIO requests, incorrect sector-based accounting for misaligned direct I/O buffers could lead to an infinite loop. This issue can cause I/O operations to hang indefinitely, resulting in a denial of service (DoS) for the affected system. A local attacker could exploit this by performing specific misaligned direct I/O operations to a dm-mirror device.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json)

**kernel: dm-io: clone the source bio instead of copying its biovec** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10

Not affected:

- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope