---
id: CVE-2026-31485
title: 'spi: spi-fsl-lpspi: fix teardown order issue (UAF)'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  spi: spi-fsl-lpspi: fix teardown order issue (UAF)

  There is a teardown order issue in the driver. The SPI controller is
  registered using devm_spi_register_controller()…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    ca4483f36ac1b62e69f8b182c5b8f059e0abecfb
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    e3fd54f8b0317fbccc103961ddd660f2a32dcf0b
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    adb25339b66112393fd6892ceff926765feb5b86
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    d5d01f24bc6fbde40b4e567ef9160194b61267bc
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    15650dfbaeeb14bcaaf053b93cf631db8d465300
  - >-
    Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e <
    b341c1176f2e001b3adf0b47154fc31589f7410e
  - Linux 4.10
published: '2026-04-22'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:47:23.252Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31485'
references:
  - url: 'https://git.kernel.org/stable/c/fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6'
  - url: 'https://git.kernel.org/stable/c/ca4483f36ac1b62e69f8b182c5b8f059e0abecfb'
  - url: 'https://git.kernel.org/stable/c/e3fd54f8b0317fbccc103961ddd660f2a32dcf0b'
  - url: 'https://git.kernel.org/stable/c/adb25339b66112393fd6892ceff926765feb5b86'
  - url: 'https://git.kernel.org/stable/c/d5d01f24bc6fbde40b4e567ef9160194b61267bc'
  - url: 'https://git.kernel.org/stable/c/e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3'
  - url: 'https://git.kernel.org/stable/c/15650dfbaeeb14bcaaf053b93cf631db8d465300'
  - url: 'https://git.kernel.org/stable/c/b341c1176f2e001b3adf0b47154fc31589f7410e'
tags:
  - cve.org
epss: 0.00179
epssPercentile: 0.06564
ingestedAt: '2026-09-08T15:33:26.990Z'
---

## Overview

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

spi: spi-fsl-lpspi: fix teardown order issue (UAF)

There is a teardown order issue in the driver. The SPI controller is
registered using devm_spi_register_controller(), which delays
unregistration of the SPI controller until after the fsl_lpspi_remove()
function returns.

As the fsl_lpspi_remove() function synchronously tears down the DMA
channels, a running SPI transfer triggers the following NULL pointer
dereference due to use after free:

| fsl_lpspi 42550000.spi: I/O Error in DMA RX
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[...]
| Call trace:
|  fsl_lpspi_dma_transfer+0x260/0x340 [spi_fsl_lpspi]
|  fsl_lpspi_transfer_one+0x198/0x448 [spi_fsl_lpspi]
|  spi_transfer_one_message+0x49c/0x7c8
|  __spi_pump_transfer_message+0x120/0x420
|  __spi_sync+0x2c4/0x520
|  spi_sync+0x34/0x60
|  spidev_message+0x20c/0x378 [spidev]
|  spidev_ioctl+0x398/0x750 [spidev]
[...]

Switch from devm_spi_register_controller() to spi_register_controller() in
fsl_lpspi_probe() and add the corresponding spi_unregister_controller() in
fsl_lpspi_remove().

## Affected

- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < ca4483f36ac1b62e69f8b182c5b8f059e0abecfb`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < e3fd54f8b0317fbccc103961ddd660f2a32dcf0b`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < adb25339b66112393fd6892ceff926765feb5b86`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < d5d01f24bc6fbde40b4e567ef9160194b61267bc`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < 15650dfbaeeb14bcaaf053b93cf631db8d465300`
- `Linux >= 5314987de5e5f5e38436ef4a69328bc472bbd63e < b341c1176f2e001b3adf0b47154fc31589f7410e`
- `Linux 4.10`

## Remediation

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