---
id: CVE-2026-64420
title: 'mfd: cros_ec: Delay dev_set_drvdata() until probe success'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mfd: cros_ec: Delay dev_set_drvdata() until probe success

  If ec_device_probe() fails, cros_ec_class_release releases memory for the
  cros_ec_dev structure. However, bec…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    24522713034d521ea4b5f5f36342e2b2f7e73bd6
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    f7e81dc181d9fe8ab977158042cd193e8cc12091
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    257203d83204b192d1265a916b42ca0d499bb117
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    729ae27dc2503a7c1f92da1859efb45da03e4fa0
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    ed2941e5db016a0c600b25f1972620e6e223d9fa
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    b5f41d5bf08e7b1b14fa0bd640975e6d78dc006d
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    fc030c5b116f668d4ca86dca63742ddbc98d1665
  - >-
    Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b <
    8b2c1d41bc36c100b38ce5ee6def246c527eaf8a
  - Linux 4.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:40:26.658329Z'
published: '2026-07-25'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:34.813Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64420'
references:
  - url: 'https://git.kernel.org/stable/c/24522713034d521ea4b5f5f36342e2b2f7e73bd6'
  - url: 'https://git.kernel.org/stable/c/f7e81dc181d9fe8ab977158042cd193e8cc12091'
  - url: 'https://git.kernel.org/stable/c/257203d83204b192d1265a916b42ca0d499bb117'
  - url: 'https://git.kernel.org/stable/c/729ae27dc2503a7c1f92da1859efb45da03e4fa0'
  - url: 'https://git.kernel.org/stable/c/ed2941e5db016a0c600b25f1972620e6e223d9fa'
  - url: 'https://git.kernel.org/stable/c/b5f41d5bf08e7b1b14fa0bd640975e6d78dc006d'
  - url: 'https://git.kernel.org/stable/c/fc030c5b116f668d4ca86dca63742ddbc98d1665'
  - url: 'https://git.kernel.org/stable/c/8b2c1d41bc36c100b38ce5ee6def246c527eaf8a'
tags:
  - cve.org
epss: 0.00118
epssPercentile: 0.01612
ingestedAt: '2026-10-16T17:24:46.818Z'
---

## Overview

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

mfd: cros_ec: Delay dev_set_drvdata() until probe success

If ec_device_probe() fails, cros_ec_class_release releases memory for the
cros_ec_dev structure. However, because the drvdata was already set,
sub-drivers like cros_ec_typec can still retrieve the stale pointer via the
platform device. This leads to a use-after-free when cros_ec_typec attempts
to access &typec->ec->ec->dev on a device that has already been released.
Move dev_set_drvdata() to ensure that the pointer is only made available
once all initialization steps have succeeded.

 sysfs: cannot create duplicate filename '/class/chromeos/cros_ec'
 Call trace:
  sysfs_do_create_link_sd+0x94/0xdc
  sysfs_create_link+0x30/0x44
  device_add_class_symlinks+0x90/0x13c
  device_add+0xf0/0x50c
  ec_device_probe+0x150/0x4f0
  platform_probe+0xa0/0xe0
 ...
 BUG: KASAN: invalid-access in __memcpy+0x44/0x230
 Write at addr f5ffff809e2d33ac by task kworker/u32:5/125
 Pointer tag: [f5], memory tag: [fe]
 Tainted : [W]=WARN, [O]=OOT_MODULE
 Hardware name: Google Navi unprovisioned 0x7FFFFFFF/sku0 board/sku3
 Workqueue: events_unbound deferred_probe_work_func
 Call trace:
  __memcpy+0x44/0x230
  cros_ec_check_features+0x60/0xcc [cros_ec_proto]
  cros_typec_probe+0xe8/0x6e0 [cros_ec_typec]
  platform_probe+0xa0/0xe0

## Affected

- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < 24522713034d521ea4b5f5f36342e2b2f7e73bd6`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < f7e81dc181d9fe8ab977158042cd193e8cc12091`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < 257203d83204b192d1265a916b42ca0d499bb117`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < 729ae27dc2503a7c1f92da1859efb45da03e4fa0`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < ed2941e5db016a0c600b25f1972620e6e223d9fa`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < b5f41d5bf08e7b1b14fa0bd640975e6d78dc006d`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < fc030c5b116f668d4ca86dca63742ddbc98d1665`
- `Linux >= 1c1d152cc5ac3a67d199728a9ba0b4f54a498f8b < 8b2c1d41bc36c100b38ce5ee6def246c527eaf8a`
- `Linux 4.12`

## Remediation

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