---
id: CVE-2026-53314
title: 'padata: Put CPU offline callback in ONLINE section to allow failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  padata: Put CPU offline callback in ONLINE section to allow failure

  syzbot reported the following warning:

      DEAD callback error for CPU1
      WARNING: kernel/cpu.c:…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d <
    65dae8b34f0810f3fa9f77c4c63650cd20820693
  - >-
    Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d <
    a6d44f477000c6352de6b05e9e276e62083e5fbf
  - >-
    Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d <
    3e6c08dd97dcd22a00aee469e0adfa819071d80e
  - >-
    Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d <
    5a9f29a3e076b637d2234093e57989cf755ded5b
  - >-
    Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d <
    9afe53f14a2aae8c4beb30e5ea51641a34f1a3d3
  - >-
    Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d <
    c8c4a2972f83c8b68ff03b43cecdb898939ff851
  - Linux 2b1207801c393a5e9af2fbac2dd8b0377d8ae63a
  - Linux 0685dfa0a2ff7635c0b64f7b7f0fafbf1c3e0c14
  - Linux 3f4d3d010477365ee1aefedc3ad52563740b777e
  - Linux >= 4.19.202 < 4.20
  - Linux >= 5.4.22 < 5.5
  - Linux >= 5.5.6 < 5.6
  - Linux 5.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:26:23.084506Z'
published: '2026-06-26'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:34:20.026Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53314'
references:
  - url: 'https://git.kernel.org/stable/c/65dae8b34f0810f3fa9f77c4c63650cd20820693'
  - url: 'https://git.kernel.org/stable/c/a6d44f477000c6352de6b05e9e276e62083e5fbf'
  - url: 'https://git.kernel.org/stable/c/3e6c08dd97dcd22a00aee469e0adfa819071d80e'
  - url: 'https://git.kernel.org/stable/c/5a9f29a3e076b637d2234093e57989cf755ded5b'
  - url: 'https://git.kernel.org/stable/c/9afe53f14a2aae8c4beb30e5ea51641a34f1a3d3'
  - url: 'https://git.kernel.org/stable/c/c8c4a2972f83c8b68ff03b43cecdb898939ff851'
tags:
  - cve.org
epss: 0.00118
epssPercentile: 0.01746
ingestedAt: '2026-11-06T16:57:43.249Z'
---

## Overview

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

padata: Put CPU offline callback in ONLINE section to allow failure

syzbot reported the following warning:

    DEAD callback error for CPU1
    WARNING: kernel/cpu.c:1463 at _cpu_down+0x759/0x1020 kernel/cpu.c:1463, CPU#0: syz.0.1960/14614

at commit 4ae12d8bd9a8 ("Merge tag 'kbuild-fixes-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux")
which tglx traced to padata_cpu_dead() given it's the only
sub-CPUHP_TEARDOWN_CPU callback that returns an error.

Failure isn't allowed in hotplug states before CPUHP_TEARDOWN_CPU
so move the CPU offline callback to the ONLINE section where failure is
possible.

## Affected

- `Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d < 65dae8b34f0810f3fa9f77c4c63650cd20820693`
- `Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d < a6d44f477000c6352de6b05e9e276e62083e5fbf`
- `Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d < 3e6c08dd97dcd22a00aee469e0adfa819071d80e`
- `Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d < 5a9f29a3e076b637d2234093e57989cf755ded5b`
- `Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d < 9afe53f14a2aae8c4beb30e5ea51641a34f1a3d3`
- `Linux >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d < c8c4a2972f83c8b68ff03b43cecdb898939ff851`
- `Linux 2b1207801c393a5e9af2fbac2dd8b0377d8ae63a`
- `Linux 0685dfa0a2ff7635c0b64f7b7f0fafbf1c3e0c14`
- `Linux 3f4d3d010477365ee1aefedc3ad52563740b777e`
- `Linux >= 4.19.202 < 4.20`
- `Linux >= 5.4.22 < 5.5`
- `Linux >= 5.5.6 < 5.6`
- `Linux 5.6`

## Remediation

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