---
id: CVE-2026-93150
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cgroup/cpuset: Make nr_deadline_tasks an atomic_t

  The nr_deadline_tasks variable in the cpuset structure was introduced by
  commit 6c24849f5515 ("sched/cpuset: Keep tra…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cgroup/cpuset: Make nr_deadline_tasks an atomic_t

  The nr_deadline_tasks variable in the cpuset structure was introduced by
  commit 6c24849f5515 ("sched/cpuset: Keep tra…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6c24849f5515e4966d94fa5279bdff4acf2e9489 <
    e422b32e6a57269ca8164c60674a78bee85cf5fb
  - >-
    Linux >= 6c24849f5515e4966d94fa5279bdff4acf2e9489 <
    e5965ae3f7c918151b87e5c925b7978afbeaf638
  - >-
    Linux >= 6c24849f5515e4966d94fa5279bdff4acf2e9489 <
    78d9daf5e13ad1448b7dfebac949936710ec7565
  - >-
    Linux >= 6c24849f5515e4966d94fa5279bdff4acf2e9489 <
    95220e1f18f6321008f021abc7d6f581f64bcb82
  - Linux 5ac05ce5684315d0e71194a63febaf33921c3268
  - Linux 43d8cbfefa7c59bd3b5fe184535eca476d45304e
  - Linux d1b4262b78cc7638642833252ae92fc586854ffb
  - Linux 74fac5bb0d375d6b8f5e7997925063c509089c9c
  - Linux >= 5.10.193 < 5.11
  - Linux >= 5.15.129 < 5.16
  - Linux >= 6.1.50 < 6.2
  - Linux >= 6.4.13 < 6.5
  - Linux 6.5
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:18:10.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93150'
references:
  - url: 'https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.741Z'
epss: 0.00209
epssPercentile: 0.09794
---

## Overview

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

cgroup/cpuset: Make nr_deadline_tasks an atomic_t

The nr_deadline_tasks variable in the cpuset structure was introduced by
commit 6c24849f5515 ("sched/cpuset: Keep track of SCHED_DEADLINE task
in cpusets"). It is reported by sashiko [1] that nr_deadline_tasks
can currently be modified by inc_dl_tasks_cs() under rq->lock and
by cpuset_attach() under cpuset_mutex. So if both updates happen
simultaneously, the nr_deadline_tasks variable can be corrupted leading
to incorrect operations down the road.

Fix that by changing its type to atomic_t so that nr_deadline_tasks
are always atomically updated. This fix patch is a low hanging fruit.
It can handle some of the races between a concurrent sched_setscheduler()
and cpuset_can_attach()/cpuset_attach() calls, but not all of them like
the other issue raised by sashiko [2]. This will be handled hopefully
in a future follow up patch.

[1] https://sashiko.dev/#/patchset/20260626181923.133658-1-longman%40redhat.com
[2] https://sashiko.dev/#/patchset/20260630033344.352702-1-longman%40redhat.com

## Remediation

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