---
id: CVE-2026-89584
title: 'block: validate user space vectors during extraction'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  block: validate user space vectors during extraction

  The bio-based drivers don't necessarily check the alignment split, and
  stacking block drivers don't always handle …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-1288
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be <
    d44a97a3b1c00cc571245124e23e5ceb0a0225a0
  - >-
    Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be <
    14b007e178811db72fbb1ebb3535160db6ec1e6a
  - Linux 6.18
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:17.054Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89584'
references:
  - url: 'https://git.kernel.org/stable/c/d44a97a3b1c00cc571245124e23e5ceb0a0225a0'
  - url: 'https://git.kernel.org/stable/c/14b007e178811db72fbb1ebb3535160db6ec1e6a'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89584.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89584'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532265'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89584'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89584'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89584.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00165
epssPercentile: 0.0568
scores:
  cna: 7.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

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

block: validate user space vectors during extraction

The bio-based drivers don't necessarily check the alignment split, and
stacking block drivers don't always handle a misalignment detected after
submitting the bio. Validate user vectors against the device's
dma_alignment as the bio is built from the iov_iter, rejecting
misaligned early with -EINVAL.

## Affected

- `Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be < d44a97a3b1c00cc571245124e23e5ceb0a0225a0`
- `Linux >= 5ff3f74e145adc79b49668adb8de276446acf6be < 14b007e178811db72fbb1ebb3535160db6ec1e6a`
- `Linux 6.18`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89584.json)