---
id: CVE-2023-53292
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

  After grabbing q->sysfs_lock, q->elevator may become NULL because of
  elevator switch.

  Fix the NU…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

  After grabbing q->sysfs_lock, q->elevator may become NULL because of
  elevator switch.

  Fix the NU…
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-476
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 6.4.7
patched:
  - linux_kernel 6.4.7
published: '2025-09-16'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T09:17:16.520'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-53292'
references:
  - url: 'https://git.kernel.org/stable/c/245165658e1c9f95c0fecfe02b9b1ebd30a1198a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3e977386521b71471e66ec2ba82efdfcc456adf2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/988ddb77218d3975dd13dee7bb0e1fae098a9fdb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-01-14T18:11:24.787022Z'
epss: 0.00146
epssPercentile: 0.04226
ingestedAt: '2026-09-08T09:30:06.831Z'
---

## Overview

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

blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

After grabbing q->sysfs_lock, q->elevator may become NULL because of
elevator switch.

Fix the NULL dereference on q->elevator by checking it with lock.

## Affected

- `linux_kernel < 6.4.7`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.4.7`