---
id: CVE-2025-40070
title: 'pps: fix warning in pps_register_cdev when register device fail'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  pps: fix warning in pps_register_cdev when register device fail

  Similar to previous commit 2a934fdb01db ("media: v4l2-dev: fix error
  handling in __video_register_devic…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 785c78ed0d39d1717cca3ef931d3e51337b5e90e <
    38c7bb10aae5118dd48fa7a82f7bf93839bcc320
  - >-
    Linux >= 1a7735ab2cb9747518a7416fb5929e85442dec62 <
    2a194707ca27a3b0523023fa8b446e5ec922dc51
  - >-
    Linux >= c4041b6b0a7a3def8cf3f3d6120ff337bc4c40f7 <
    125527db41805693208ee1aacd7f3ffe6a3a489c
  - >-
    Linux >= 91932db1d96b2952299ce30c1c693d834d10ace6 <
    4cbd7450a22c5ee4842fc4175ad06c0c82ea53a8
  - >-
    Linux >= cd3bbcb6b3a7caa5ce67de76723b6d8531fb7f64 <
    cf71834a0cfc394c72d62fd6dbb470ee13cf8f5e
  - >-
    Linux >= 7e5ee3281dc09014367f5112b6d566ba36ea2d49 <
    f01fa3588e0b3cb1540f56d2c6bd99e5b3810234
  - >-
    Linux >= c79a39dc8d060b9e64e8b0fa9d245d44befeefbe <
    0f97564a1fb62f34b3b498e2f12caffbe99c004a
  - >-
    Linux >= c79a39dc8d060b9e64e8b0fa9d245d44befeefbe <
    b0531cdba5029f897da5156815e3bdafe1e9b88d
  - Linux 85241f7de216f8298f6e48540ea13d7dcd100870
  - Linux >= 5.4.291 < 5.4.301
  - Linux >= 5.10.235 < 5.10.246
  - Linux >= 5.15.179 < 5.15.195
  - Linux >= 6.1.129 < 6.1.156
  - Linux >= 6.6.76 < 6.6.112
  - Linux >= 6.12.13 < 6.12.53
  - Linux >= 6.13.2 < 6.14
  - Linux 6.14
published: '2025-10-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:42:45.157Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-40070'
references:
  - url: 'https://git.kernel.org/stable/c/38c7bb10aae5118dd48fa7a82f7bf93839bcc320'
  - url: 'https://git.kernel.org/stable/c/2a194707ca27a3b0523023fa8b446e5ec922dc51'
  - url: 'https://git.kernel.org/stable/c/125527db41805693208ee1aacd7f3ffe6a3a489c'
  - url: 'https://git.kernel.org/stable/c/4cbd7450a22c5ee4842fc4175ad06c0c82ea53a8'
  - url: 'https://git.kernel.org/stable/c/cf71834a0cfc394c72d62fd6dbb470ee13cf8f5e'
  - url: 'https://git.kernel.org/stable/c/f01fa3588e0b3cb1540f56d2c6bd99e5b3810234'
  - url: 'https://git.kernel.org/stable/c/0f97564a1fb62f34b3b498e2f12caffbe99c004a'
  - url: 'https://git.kernel.org/stable/c/b0531cdba5029f897da5156815e3bdafe1e9b88d'
tags:
  - cve.org
epss: 0.00218
epssPercentile: 0.12491
ingestedAt: '2026-09-08T15:33:26.996Z'
---

## Overview

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

pps: fix warning in pps_register_cdev when register device fail

Similar to previous commit 2a934fdb01db ("media: v4l2-dev: fix error
handling in __video_register_device()"), the release hook should be set
before device_register(). Otherwise, when device_register() return error
and put_device() try to callback the release function, the below warning
may happen.

  ------------[ cut here ]------------
  WARNING: CPU: 1 PID: 4760 at drivers/base/core.c:2567 device_release+0x1bd/0x240 drivers/base/core.c:2567
  Modules linked in:
  CPU: 1 UID: 0 PID: 4760 Comm: syz.4.914 Not tainted 6.17.0-rc3+ #1 NONE
  RIP: 0010:device_release+0x1bd/0x240 drivers/base/core.c:2567
  Call Trace:
   <TASK>
   kobject_cleanup+0x136/0x410 lib/kobject.c:689
   kobject_release lib/kobject.c:720 [inline]
   kref_put include/linux/kref.h:65 [inline]
   kobject_put+0xe9/0x130 lib/kobject.c:737
   put_device+0x24/0x30 drivers/base/core.c:3797
   pps_register_cdev+0x2da/0x370 drivers/pps/pps.c:402
   pps_register_source+0x2f6/0x480 drivers/pps/kapi.c:108
   pps_tty_open+0x190/0x310 drivers/pps/clients/pps-ldisc.c:57
   tty_ldisc_open+0xa7/0x120 drivers/tty/tty_ldisc.c:432
   tty_set_ldisc+0x333/0x780 drivers/tty/tty_ldisc.c:563
   tiocsetd drivers/tty/tty_io.c:2429 [inline]
   tty_ioctl+0x5d1/0x1700 drivers/tty/tty_io.c:2728
   vfs_ioctl fs/ioctl.c:51 [inline]
   __do_sys_ioctl fs/ioctl.c:598 [inline]
   __se_sys_ioctl fs/ioctl.c:584 [inline]
   __x64_sys_ioctl+0x194/0x210 fs/ioctl.c:584
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x5f/0x2a0 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x76/0x7e
   </TASK>

Before commit c79a39dc8d06 ("pps: Fix a use-after-free"),
pps_register_cdev() call device_create() to create pps->dev, which will
init dev->release to device_create_release(). Now the comment is outdated,
just remove it.

Thanks for the reminder from Calvin Owens, 'kfree_pps' should be removed
in pps_register_source() to avoid a double free in the failure case.

## Affected

- `Linux >= 785c78ed0d39d1717cca3ef931d3e51337b5e90e < 38c7bb10aae5118dd48fa7a82f7bf93839bcc320`
- `Linux >= 1a7735ab2cb9747518a7416fb5929e85442dec62 < 2a194707ca27a3b0523023fa8b446e5ec922dc51`
- `Linux >= c4041b6b0a7a3def8cf3f3d6120ff337bc4c40f7 < 125527db41805693208ee1aacd7f3ffe6a3a489c`
- `Linux >= 91932db1d96b2952299ce30c1c693d834d10ace6 < 4cbd7450a22c5ee4842fc4175ad06c0c82ea53a8`
- `Linux >= cd3bbcb6b3a7caa5ce67de76723b6d8531fb7f64 < cf71834a0cfc394c72d62fd6dbb470ee13cf8f5e`
- `Linux >= 7e5ee3281dc09014367f5112b6d566ba36ea2d49 < f01fa3588e0b3cb1540f56d2c6bd99e5b3810234`
- `Linux >= c79a39dc8d060b9e64e8b0fa9d245d44befeefbe < 0f97564a1fb62f34b3b498e2f12caffbe99c004a`
- `Linux >= c79a39dc8d060b9e64e8b0fa9d245d44befeefbe < b0531cdba5029f897da5156815e3bdafe1e9b88d`
- `Linux 85241f7de216f8298f6e48540ea13d7dcd100870`
- `Linux >= 5.4.291 < 5.4.301`
- `Linux >= 5.10.235 < 5.10.246`
- `Linux >= 5.15.179 < 5.15.195`
- `Linux >= 6.1.129 < 6.1.156`
- `Linux >= 6.6.76 < 6.6.112`
- `Linux >= 6.12.13 < 6.12.53`
- `Linux >= 6.13.2 < 6.14`
- `Linux 6.14`

## Remediation

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