---
id: CVE-2022-50477
title: 'rtc: class: Fix potential memleak in devm_rtc_allocate_device()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  rtc: class: Fix potential memleak in devm_rtc_allocate_device()

  devm_rtc_allocate_device() will alloc a rtc_device first, and then run
  dev_set_name(). If dev_set_name(…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 <
    0bcfc8fd3e596994f527b46730579428b3a4fa5f
  - >-
    Linux >= 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 <
    59457a0f079eae19aaf322b3cc1c8ba66f55c5f3
  - >-
    Linux >= 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 <
    60da73808298ff2cfa9f165d55eb3d7aa7078601
  - Linux 5.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:11:55.370621Z'
published: '2025-10-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:20:48.125Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50477'
references:
  - url: 'https://git.kernel.org/stable/c/0bcfc8fd3e596994f527b46730579428b3a4fa5f'
  - url: 'https://git.kernel.org/stable/c/59457a0f079eae19aaf322b3cc1c8ba66f55c5f3'
  - url: 'https://git.kernel.org/stable/c/60da73808298ff2cfa9f165d55eb3d7aa7078601'
tags:
  - cve.org
epss: 0.00157
epssPercentile: 0.04885
ingestedAt: '2026-11-05T22:38:31.742Z'
---

## Overview

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

rtc: class: Fix potential memleak in devm_rtc_allocate_device()

devm_rtc_allocate_device() will alloc a rtc_device first, and then run
dev_set_name(). If dev_set_name() failed, the rtc_device will memleak.
Move devm_add_action_or_reset() in front of dev_set_name() to prevent
memleak.

unreferenced object 0xffff888110a53000 (size 2048):
  comm "python3", pid 470, jiffies 4296078308 (age 58.882s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 08 30 a5 10 81 88 ff ff  .........0......
    08 30 a5 10 81 88 ff ff 00 00 00 00 00 00 00 00  .0..............
  backtrace:
    [<000000004aac0364>] kmalloc_trace+0x21/0x110
    [<000000000ff02202>] devm_rtc_allocate_device+0xd4/0x400
    [<000000001bdf5639>] devm_rtc_device_register+0x1a/0x80
    [<00000000351bf81c>] rx4581_probe+0xdd/0x110 [rtc_rx4581]
    [<00000000f0eba0ae>] spi_probe+0xde/0x130
    [<00000000bff89ee8>] really_probe+0x175/0x3f0
    [<00000000128e8d84>] __driver_probe_device+0xe6/0x170
    [<00000000ee5bf913>] device_driver_attach+0x32/0x80
    [<00000000f3f28f92>] bind_store+0x10b/0x1a0
    [<000000009ff812d8>] drv_attr_store+0x49/0x70
    [<000000008139c323>] sysfs_kf_write+0x8d/0xb0
    [<00000000b6146e01>] kernfs_fop_write_iter+0x214/0x2d0
    [<00000000ecbe3895>] vfs_write+0x61a/0x7d0
    [<00000000aa2196ea>] ksys_write+0xc8/0x190
    [<0000000046a600f5>] do_syscall_64+0x37/0x90
    [<00000000541a336f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

## Affected

- `Linux >= 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 < 0bcfc8fd3e596994f527b46730579428b3a4fa5f`
- `Linux >= 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 < 59457a0f079eae19aaf322b3cc1c8ba66f55c5f3`
- `Linux >= 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 < 60da73808298ff2cfa9f165d55eb3d7aa7078601`
- `Linux 5.16`

## Remediation

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