---
id: CVE-2025-21817
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  block: mark GFP_NOIO around sysfs ->store()

  sysfs ->store is called with queue freezed, meantime we have several
  ->store() callbacks(update_nr_requests, wbt, scheduler…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  block: mark GFP_NOIO around sysfs ->store()

  sysfs ->store is called with queue freezed, meantime we have several
  ->store() callbacks(update_nr_requests, wbt, scheduler…
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-667
vendor: linux
product: linux_kernel
affected:
  - linux_kernel = 6.13.2
published: '2025-02-27'
updated: '2026-09-07'
sourceUpdated: '2026-09-07T16:17:27.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-21817'
references:
  - url: 'https://git.kernel.org/stable/c/2566ce907e5d5db8a039647208e029ce559baa31'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a09280c39ea54080daf19cfaf4a3121a8d17d5cd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.0015
epssPercentile: 0.03465
ingestedAt: '2026-07-18T16:23:45.755Z'
---

## Overview

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

block: mark GFP_NOIO around sysfs ->store()

sysfs ->store is called with queue freezed, meantime we have several
->store() callbacks(update_nr_requests, wbt, scheduler) to allocate
memory with GFP_KERNEL which may run into direct reclaim code path,
then potential deadlock can be caused.

Fix the issue by marking NOIO around sysfs ->store()

## Affected

- `linux_kernel = 6.13.2`

## Remediation

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