---
id: CVE-2025-38113
title: 'ACPI: CPPC: Fix NULL pointer dereference when nosmp is used'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ACPI: CPPC: Fix NULL pointer dereference when nosmp is used

  With nosmp in cmdline, other CPUs are not brought up, leaving
  their cpc_desc_ptr NULL. CPU0's iteration via…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 <
    356d09c7f5bf525086002a34f8bae40b134d1611
  - >-
    Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 <
    c6dad167aade4bf0bef9130f2f149f4249fc4ad0
  - >-
    Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 <
    32a48db4cf28ea087214c261da8476db218d08bd
  - >-
    Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 <
    1a677d0ceb4a5d62117b711a8b2e0aee80d33015
  - >-
    Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 <
    15eece6c5b05e5f9db0711978c3e3b7f1a2cfe12
  - Linux 5.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:49:52.300331Z'
published: '2025-07-03'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:52:16.256Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38113'
references:
  - url: 'https://git.kernel.org/stable/c/356d09c7f5bf525086002a34f8bae40b134d1611'
  - url: 'https://git.kernel.org/stable/c/c6dad167aade4bf0bef9130f2f149f4249fc4ad0'
  - url: 'https://git.kernel.org/stable/c/32a48db4cf28ea087214c261da8476db218d08bd'
  - url: 'https://git.kernel.org/stable/c/1a677d0ceb4a5d62117b711a8b2e0aee80d33015'
  - url: 'https://git.kernel.org/stable/c/15eece6c5b05e5f9db0711978c3e3b7f1a2cfe12'
tags:
  - cve.org
epss: 0.00195
epssPercentile: 0.09289
ingestedAt: '2026-11-05T22:38:31.920Z'
---

## Overview

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

ACPI: CPPC: Fix NULL pointer dereference when nosmp is used

With nosmp in cmdline, other CPUs are not brought up, leaving
their cpc_desc_ptr NULL. CPU0's iteration via for_each_possible_cpu()
dereferences these NULL pointers, causing panic.

Panic backtrace:

[    0.401123] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8
...
[    0.403255] [<ffffffff809a5818>] cppc_allow_fast_switch+0x6a/0xd4
...
Kernel panic - not syncing: Attempted to kill init!

[ rjw: New subject ]

## Affected

- `Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 < 356d09c7f5bf525086002a34f8bae40b134d1611`
- `Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 < c6dad167aade4bf0bef9130f2f149f4249fc4ad0`
- `Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 < 32a48db4cf28ea087214c261da8476db218d08bd`
- `Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 < 1a677d0ceb4a5d62117b711a8b2e0aee80d33015`
- `Linux >= 3cc30dd00a580ca0c9c0b01639841cfd72d10129 < 15eece6c5b05e5f9db0711978c3e3b7f1a2cfe12`
- `Linux 5.19`

## Remediation

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