---
id: CVE-2023-54258
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cifs: fix potential oops in cifs_oplock_break

  With deferred close we can have closes that race with lease breaks,
  and so with the current checks for whether to send th…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cifs: fix potential oops in cifs_oplock_break

  With deferred close we can have closes that race with lease breaks,
  and so with the current checks for whether to send th…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-476
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 8
  - enterprise_linux 9
published: '2025-12-30'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:17:56.793'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-54258'
references:
  - url: 'https://git.kernel.org/stable/c/5ee28bcfbaacf289eb25c662a2862542ea6ce6a7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6b67a6d2e50634fe127e656147c81915955e9f5e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b99f490ea87ebcca3a429fd8837067feb56a4c7c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e8f5f849ffce24490eb9449e98312b66c0dba76f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54258.json
  - url: 'https://access.redhat.com/security/cve/CVE-2023-54258'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2426116'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2023-54258'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-54258'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2025123056-CVE-2023-54258-532c@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00555
epssPercentile: 0.46101
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-15T21:39:50.673035Z'
scores:
  nvd: 9.8
  vendor: 5.8
  cna: 9.8
ingestedAt: '2026-10-15T22:48:25.436Z'
---

## Overview

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

cifs: fix potential oops in cifs_oplock_break

With deferred close we can have closes that race with lease breaks,
and so with the current checks for whether to send the lease response,
oplock_response(), this can mean that an unmount (kill_sb) can occur
just before we were checking if the tcon->ses is valid.  See below:

[Fri Aug  4 04:12:50 2023] RIP: 0010:cifs_oplock_break+0x1f7/0x5b0 [cifs]
[Fri Aug  4 04:12:50 2023] Code: 7d a8 48 8b 7d c0 c0 e9 02 48 89 45 b8 41 89 cf e8 3e f5 ff ff 4c 89 f7 41 83 e7 01 e8 82 b3 03 f2 49 8b 45 50 48 85 c0 74 5e <48> 83 78 60 00 74 57 45 84 ff 75 52 48 8b 43 98 48 83 eb 68 48 39
[Fri Aug  4 04:12:50 2023] RSP: 0018:ffffb30607ddbdf8 EFLAGS: 00010206
[Fri Aug  4 04:12:50 2023] RAX: 632d223d32612022 RBX: ffff97136944b1e0 RCX: 0000000080100009
[Fri Aug  4 04:12:50 2023] RDX: 0000000000000001 RSI: 0000000080100009 RDI: ffff97136944b188
[Fri Aug  4 04:12:50 2023] RBP: ffffb30607ddbe58 R08: 0000000000000001 R09: ffffffffc08e0900
[Fri Aug  4 04:12:50 2023] R10: 0000000000000001 R11: 000000000000000f R12: ffff97136944b138
[Fri Aug  4 04:12:50 2023] R13: ffff97149147c000 R14: ffff97136944b188 R15: 0000000000000000
[Fri Aug  4 04:12:50 2023] FS:  0000000000000000(0000) GS:ffff9714f7c00000(0000) knlGS:0000000000000000
[Fri Aug  4 04:12:50 2023] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Fri Aug  4 04:12:50 2023] CR2: 00007fd8de9c7590 CR3: 000000011228e000 CR4: 0000000000350ef0
[Fri Aug  4 04:12:50 2023] Call Trace:
[Fri Aug  4 04:12:50 2023]  <TASK>
[Fri Aug  4 04:12:50 2023]  process_one_work+0x225/0x3d0
[Fri Aug  4 04:12:50 2023]  worker_thread+0x4d/0x3e0
[Fri Aug  4 04:12:50 2023]  ? process_one_work+0x3d0/0x3d0
[Fri Aug  4 04:12:50 2023]  kthread+0x12a/0x150
[Fri Aug  4 04:12:50 2023]  ? set_kthread_struct+0x50/0x50
[Fri Aug  4 04:12:50 2023]  ret_from_fork+0x22/0x30
[Fri Aug  4 04:12:50 2023]  </TASK>

To fix this change the ordering of the checks before sending the oplock_response
to first check if the openFileList is empty.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54258.json)