---
id: CVE-2022-50076
title: 'cifs: Fix memory leak on the deferred close'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cifs: Fix memory leak on the deferred close

  xfstests on smb21 report kmemleak as below:

    unreferenced object 0xffff8881767d6200 (size 64):
      comm "xfs_io", pid 128…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9e992755be8f2d458a0bcbefd19e493483c1dba2 <
    860efae127888ae535bc4eda1b7f27642727c69e
  - >-
    Linux >= 9e992755be8f2d458a0bcbefd19e493483c1dba2 <
    60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5
  - >-
    Linux >= 9e992755be8f2d458a0bcbefd19e493483c1dba2 <
    ca08d0eac020d48a3141dbec0a3cf64fbdb17cde
  - Linux 0ca6ac8a2691762307beaa4841255d1cfe6b2684
  - Linux >= 5.13.12 < 5.14
  - Linux 5.14
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:53:59.920129Z'
published: '2025-06-18'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:00:15.987Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50076'
references:
  - url: 'https://git.kernel.org/stable/c/860efae127888ae535bc4eda1b7f27642727c69e'
  - url: 'https://git.kernel.org/stable/c/60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5'
  - url: 'https://git.kernel.org/stable/c/ca08d0eac020d48a3141dbec0a3cf64fbdb17cde'
tags:
  - cve.org
epss: 0.00191
epssPercentile: 0.08782
ingestedAt: '2026-11-05T22:38:31.645Z'
---

## Overview

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

cifs: Fix memory leak on the deferred close

xfstests on smb21 report kmemleak as below:

  unreferenced object 0xffff8881767d6200 (size 64):
    comm "xfs_io", pid 1284, jiffies 4294777434 (age 20.789s)
    hex dump (first 32 bytes):
      80 5a d0 11 81 88 ff ff 78 8a aa 63 81 88 ff ff  .Z......x..c....
      00 71 99 76 81 88 ff ff 00 00 00 00 00 00 00 00  .q.v............
    backtrace:
      [<00000000ad04e6ea>] cifs_close+0x92/0x2c0
      [<0000000028b93c82>] __fput+0xff/0x3f0
      [<00000000d8116851>] task_work_run+0x85/0xc0
      [<0000000027e14f9e>] do_exit+0x5e5/0x1240
      [<00000000fb492b95>] do_group_exit+0x58/0xe0
      [<00000000129a32d9>] __x64_sys_exit_group+0x28/0x30
      [<00000000e3f7d8e9>] do_syscall_64+0x35/0x80
      [<00000000102e8a0b>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

When cancel the deferred close work, we should also cleanup the struct
cifs_deferred_close.

## Affected

- `Linux >= 9e992755be8f2d458a0bcbefd19e493483c1dba2 < 860efae127888ae535bc4eda1b7f27642727c69e`
- `Linux >= 9e992755be8f2d458a0bcbefd19e493483c1dba2 < 60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5`
- `Linux >= 9e992755be8f2d458a0bcbefd19e493483c1dba2 < ca08d0eac020d48a3141dbec0a3cf64fbdb17cde`
- `Linux 0ca6ac8a2691762307beaa4841255d1cfe6b2684`
- `Linux >= 5.13.12 < 5.14`
- `Linux 5.14`

## Remediation

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