---
id: CVE-2026-53237
title: 'gpio: mvebu: fix NULL pointer dereference in suspend/resume'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  gpio: mvebu: fix NULL pointer dereference in suspend/resume

  mvebu_pwm_suspend() and mvebu_pwm_resume() are called for all GPIO
  banks during suspend/resume, but not all…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 <
    3cb53f89049c3769e102ac5b7692e679a1d45510
  - >-
    Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 <
    7db09011ce62162d72897fc4856b4425245dfe35
  - >-
    Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 <
    4ef24338eda3c7e96d6f94a988266ff16ed3985d
  - >-
    Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 <
    6136c1474db88272231573e222896e1998d34662
  - >-
    Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 <
    c9677a9274ffb44987ec209dc8ec9f2d34946956
  - >-
    Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 <
    b9ad50d7505ebd48282ec3630258dc820fc85c81
  - Linux 4.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:23:17.082558Z'
published: '2026-06-25'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:24:08.415Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53237'
references:
  - url: 'https://git.kernel.org/stable/c/3cb53f89049c3769e102ac5b7692e679a1d45510'
  - url: 'https://git.kernel.org/stable/c/7db09011ce62162d72897fc4856b4425245dfe35'
  - url: 'https://git.kernel.org/stable/c/4ef24338eda3c7e96d6f94a988266ff16ed3985d'
  - url: 'https://git.kernel.org/stable/c/6136c1474db88272231573e222896e1998d34662'
  - url: 'https://git.kernel.org/stable/c/c9677a9274ffb44987ec209dc8ec9f2d34946956'
  - url: 'https://git.kernel.org/stable/c/b9ad50d7505ebd48282ec3630258dc820fc85c81'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02034
ingestedAt: '2026-11-05T15:02:32.368Z'
---

## Overview

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

gpio: mvebu: fix NULL pointer dereference in suspend/resume

mvebu_pwm_suspend() and mvebu_pwm_resume() are called for all GPIO
banks during suspend/resume, but not all banks have PWM functionality.
GPIO banks without PWM have mvchip->mvpwm set to NULL.

Calling mvebu_pwm_suspend() with mvpwm == NULL causes a NULL pointer
dereference when it tries to access mvpwm->blink_select.

  Unable to handle kernel NULL pointer dereference at virtual address 00000020 when write
  [00000020] *pgd=00000000
  Internal error: Oops: 815 [#1] PREEMPT ARM
  Modules linked in:
  CPU: 0 UID: 0 PID: 406 Comm: sh Not tainted 6.12.74-rt12-yocto-standard-g4e96f98fb7db-dirty #353
  Hardware name: Marvell Armada 370/XP (Device Tree)
  PC is at regmap_mmio_read+0x38/0x54
  LR is at regmap_mmio_read+0x38/0x54
  pc : [<c05fd2ac>]    lr : [<c05fd2ac>]    psr: 200f0013
  sp : f0c11d10  ip : 00000000  fp : c100d2f0
  r10: c14fb854  r9 : 00000000  r8 : 00000000
  r7 : c1799c00  r6 : 00000020  r5 : 00000020  r4 : c179c7c0
  r3 : f0a231a0  r2 : 00000020  r1 : 00000020  r0 : 00000000
  Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
  Control: 10c5387d  Table: 135ec059  DAC: 00000051
  Call trace:
   regmap_mmio_read from _regmap_bus_reg_read+0x78/0xac
   _regmap_bus_reg_read from _regmap_read+0x60/0x154
   _regmap_read from regmap_read+0x3c/0x60
   regmap_read from mvebu_gpio_suspend+0xa4/0x14c
   mvebu_gpio_suspend from dpm_run_callback+0x54/0x180
   dpm_run_callback from device_suspend+0x124/0x630
   device_suspend from dpm_suspend+0x124/0x270
   dpm_suspend from dpm_suspend_start+0x64/0x6c
   dpm_suspend_start from suspend_devices_and_enter+0x140/0x8e8
   suspend_devices_and_enter from pm_suspend+0x2fc/0x308
   pm_suspend from state_store+0x6c/0xc8
   state_store from kernfs_fop_write_iter+0x10c/0x1f8
   kernfs_fop_write_iter from vfs_write+0x270/0x468
   vfs_write from ksys_write+0x70/0xf0
   ksys_write from ret_fast_syscall+0x0/0x54

Add a NULL check for mvchip->mvpwm before calling the PWM
suspend/resume functions.

## Affected

- `Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 < 3cb53f89049c3769e102ac5b7692e679a1d45510`
- `Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 < 7db09011ce62162d72897fc4856b4425245dfe35`
- `Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 < 4ef24338eda3c7e96d6f94a988266ff16ed3985d`
- `Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 < 6136c1474db88272231573e222896e1998d34662`
- `Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 < c9677a9274ffb44987ec209dc8ec9f2d34946956`
- `Linux >= 757642f9a584e893f3f4e50c99b674ee8a3ed363 < b9ad50d7505ebd48282ec3630258dc820fc85c81`
- `Linux 4.12`

## Remediation

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