---
id: CVE-2022-50494
title: >-
  thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to
  avoid crash
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to
  avoid crash


  When CPU 0 is offline and intel_powerclamp is used to inject

  idle, it generates k…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    3e799e815097febbcb81b472285be824f5d089f9
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    0f91f66c568b316b19cb042cf50584467b3bdff4
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    6904727db0eb62fb0c2dce1cf331c341d97ee4b7
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    5a646c38f648185ee2c62f2a19da3c6f04e27612
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    513943bf879d45005213e6f5cfb7d9e9943f589f
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    5614908434451aafbf9b24cb5247cf1d21269f76
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    6e2a347b304224b2aeb1c0ea000d1cf8a02cc592
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    418fae0700e85a498062424f8656435c32cdb200
  - >-
    Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 <
    68b99e94a4a2db6ba9b31fe0485e057b9354a640
  - Linux 3.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:12:17.132374Z'
published: '2025-10-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:20:49.066Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50494'
references:
  - url: 'https://git.kernel.org/stable/c/3e799e815097febbcb81b472285be824f5d089f9'
  - url: 'https://git.kernel.org/stable/c/0f91f66c568b316b19cb042cf50584467b3bdff4'
  - url: 'https://git.kernel.org/stable/c/6904727db0eb62fb0c2dce1cf331c341d97ee4b7'
  - url: 'https://git.kernel.org/stable/c/5a646c38f648185ee2c62f2a19da3c6f04e27612'
  - url: 'https://git.kernel.org/stable/c/513943bf879d45005213e6f5cfb7d9e9943f589f'
  - url: 'https://git.kernel.org/stable/c/5614908434451aafbf9b24cb5247cf1d21269f76'
  - url: 'https://git.kernel.org/stable/c/6e2a347b304224b2aeb1c0ea000d1cf8a02cc592'
  - url: 'https://git.kernel.org/stable/c/418fae0700e85a498062424f8656435c32cdb200'
  - url: 'https://git.kernel.org/stable/c/68b99e94a4a2db6ba9b31fe0485e057b9354a640'
tags:
  - cve.org
epss: 0.00163
epssPercentile: 0.05562
ingestedAt: '2026-11-05T22:38:31.742Z'
---

## Overview

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

thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to avoid crash

When CPU 0 is offline and intel_powerclamp is used to inject
idle, it generates kernel BUG:

BUG: using smp_processor_id() in preemptible [00000000] code: bash/15687
caller is debug_smp_processor_id+0x17/0x20
CPU: 4 PID: 15687 Comm: bash Not tainted 5.19.0-rc7+ #57
Call Trace:
<TASK>
dump_stack_lvl+0x49/0x63
dump_stack+0x10/0x16
check_preemption_disabled+0xdd/0xe0
debug_smp_processor_id+0x17/0x20
powerclamp_set_cur_state+0x7f/0xf9 [intel_powerclamp]
...
...

Here CPU 0 is the control CPU by default and changed to the current CPU,
if CPU 0 offlined. This check has to be performed under cpus_read_lock(),
hence the above warning.

Use get_cpu() instead of smp_processor_id() to avoid this BUG.

[ rjw: Subject edits ]

## Affected

- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 3e799e815097febbcb81b472285be824f5d089f9`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 0f91f66c568b316b19cb042cf50584467b3bdff4`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 6904727db0eb62fb0c2dce1cf331c341d97ee4b7`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 5a646c38f648185ee2c62f2a19da3c6f04e27612`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 513943bf879d45005213e6f5cfb7d9e9943f589f`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 5614908434451aafbf9b24cb5247cf1d21269f76`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 6e2a347b304224b2aeb1c0ea000d1cf8a02cc592`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 418fae0700e85a498062424f8656435c32cdb200`
- `Linux >= d6d71ee4a14ae602db343ec48c491851d7ec5267 < 68b99e94a4a2db6ba9b31fe0485e057b9354a640`
- `Linux 3.9`

## Remediation

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