---
id: CVE-2024-56583
title: 'sched/deadline: Fix warning in migrate_enable for boosted tasks'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sched/deadline: Fix warning in migrate_enable for boosted tasks

  When running the following command:

  while true; do
      stress-ng --cyclic 30 --timeout 30s --minimize …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 295d6d5e373607729bcc8182c25afe964655714f <
    6923c1b117a93477c392a1d46da73ef40987a091
  - >-
    Linux >= 295d6d5e373607729bcc8182c25afe964655714f <
    b600d30402854415aa57548a6b53dc6478f65517
  - >-
    Linux >= 295d6d5e373607729bcc8182c25afe964655714f <
    e41074904d9ed3fe582d6e544c77b40c22043c82
  - >-
    Linux >= 295d6d5e373607729bcc8182c25afe964655714f <
    0664e2c311b9fa43b33e3e81429cd0c2d7f9c638
  - Linux fd8cb2e71cdd8e814cbdadddd0d0e6e3d49eaa2c
  - Linux >= 4.14.70 < 4.15
  - Linux 4.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:28:52.906552Z'
published: '2024-12-27'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:31:24.188Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-56583'
references:
  - url: 'https://git.kernel.org/stable/c/6923c1b117a93477c392a1d46da73ef40987a091'
  - url: 'https://git.kernel.org/stable/c/b600d30402854415aa57548a6b53dc6478f65517'
  - url: 'https://git.kernel.org/stable/c/e41074904d9ed3fe582d6e544c77b40c22043c82'
  - url: 'https://git.kernel.org/stable/c/0664e2c311b9fa43b33e3e81429cd0c2d7f9c638'
tags:
  - cve.org
epss: 0.00231
epssPercentile: 0.14071
ingestedAt: '2026-11-03T14:47:02.523Z'
---

## Overview

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

sched/deadline: Fix warning in migrate_enable for boosted tasks

When running the following command:

while true; do
    stress-ng --cyclic 30 --timeout 30s --minimize --quiet
done

a warning is eventually triggered:

WARNING: CPU: 43 PID: 2848 at kernel/sched/deadline.c:794
setup_new_dl_entity+0x13e/0x180
...
Call Trace:
 <TASK>
 ? show_trace_log_lvl+0x1c4/0x2df
 ? enqueue_dl_entity+0x631/0x6e0
 ? setup_new_dl_entity+0x13e/0x180
 ? __warn+0x7e/0xd0
 ? report_bug+0x11a/0x1a0
 ? handle_bug+0x3c/0x70
 ? exc_invalid_op+0x14/0x70
 ? asm_exc_invalid_op+0x16/0x20
 enqueue_dl_entity+0x631/0x6e0
 enqueue_task_dl+0x7d/0x120
 __do_set_cpus_allowed+0xe3/0x280
 __set_cpus_allowed_ptr_locked+0x140/0x1d0
 __set_cpus_allowed_ptr+0x54/0xa0
 migrate_enable+0x7e/0x150
 rt_spin_unlock+0x1c/0x90
 group_send_sig_info+0xf7/0x1a0
 ? kill_pid_info+0x1f/0x1d0
 kill_pid_info+0x78/0x1d0
 kill_proc_info+0x5b/0x110
 __x64_sys_kill+0x93/0xc0
 do_syscall_64+0x5c/0xf0
 entry_SYSCALL_64_after_hwframe+0x6e/0x76
 RIP: 0033:0x7f0dab31f92b

This warning occurs because set_cpus_allowed dequeues and enqueues tasks
with the ENQUEUE_RESTORE flag set. If the task is boosted, the warning
is triggered. A boosted task already had its parameters set by
rt_mutex_setprio, and a new call to setup_new_dl_entity is unnecessary,
hence the WARN_ON call.

Check if we are requeueing a boosted task and avoid calling
setup_new_dl_entity if that's the case.

## Affected

- `Linux >= 295d6d5e373607729bcc8182c25afe964655714f < 6923c1b117a93477c392a1d46da73ef40987a091`
- `Linux >= 295d6d5e373607729bcc8182c25afe964655714f < b600d30402854415aa57548a6b53dc6478f65517`
- `Linux >= 295d6d5e373607729bcc8182c25afe964655714f < e41074904d9ed3fe582d6e544c77b40c22043c82`
- `Linux >= 295d6d5e373607729bcc8182c25afe964655714f < 0664e2c311b9fa43b33e3e81429cd0c2d7f9c638`
- `Linux fd8cb2e71cdd8e814cbdadddd0d0e6e3d49eaa2c`
- `Linux >= 4.14.70 < 4.15`
- `Linux 4.15`

## Remediation

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