---
id: CVE-2026-90324
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ublk: check import_ubuf() return value

  import_ubuf() can fail if the address range (provided by the userspace
  ublk server) is outside the allowed user address space
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ublk: check import_ubuf() return value

  import_ubuf() can fail if the address range (provided by the userspace
  ublk server) is outside the allowed user address space. R…
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'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 981f95a571e3ca20a496c0b77dbf6b06039c6648 <
    0121c84adb6a4cd6f7560b5895bd88f9899bbc1f
  - >-
    Linux >= 981f95a571e3ca20a496c0b77dbf6b06039c6648 <
    5ac6019cb78e98c9608fda72726b36ddf8474dd7
  - >-
    Linux >= 981f95a571e3ca20a496c0b77dbf6b06039c6648 <
    3831568792af75b6523fa93bb91560e29189cf55
  - Linux 6.5
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:53.840'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90324'
references:
  - url: 'https://git.kernel.org/stable/c/0121c84adb6a4cd6f7560b5895bd88f9899bbc1f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3831568792af75b6523fa93bb91560e29189cf55'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5ac6019cb78e98c9608fda72726b36ddf8474dd7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00173
epssPercentile: 0.0592
ingestedAt: '2026-09-17T16:21:47.824Z'
---

## Overview

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

ublk: check import_ubuf() return value

import_ubuf() can fail if the address range (provided by the userspace
ublk server) is outside the allowed user address space. Return that 0
bytes were copied if import_ubuf() fails rather than passing an
uninitialized struct iov_iter to ublk_copy_user_pages().

## Remediation

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