---
id: CVE-2026-90167
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: serialize oplock close with pending break ownership

  close may abort an in-flight oplock break while another breaker already
  holds an opinfo reference
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: serialize oplock close with pending break ownership

  close may abort an in-flight oplock break while another breaker already
  holds an opinfo reference. Releasing…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <
    5f97bac88bfb333f426f01c118b8235e75af8d96
  - >-
    Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <
    b0148dc5625dbfd50596ac63c7487c12e8a8ab03
  - Linux 5.15
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:10.097'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90167'
references:
  - url: 'https://git.kernel.org/stable/c/5f97bac88bfb333f426f01c118b8235e75af8d96'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0148dc5625dbfd50596ac63c7487c12e8a8ab03'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.871Z'
epss: 0.00198
epssPercentile: 0.08464
---

## Overview

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

ksmbd: serialize oplock close with pending break ownership

close may abort an in-flight oplock break while another breaker already
holds an opinfo reference. Releasing pending_break wakes that waiter, but
without serializing the close transition with bit acquisition it can become
a new break owner through the test_and_set_bit() fast path. It can then
overwrite OPLOCK_CLOSING with OPLOCK_ACK_WAIT and continue a break for
a dying opinfo.

Make OPLOCK_CLOSING terminal once the opinfo is removed from the inode
list. Serialize that transition, pending_break acquisition, and
OPLOCK_ACK_WAIT setup with an opinfo state lock. A breaker which loses
the race releases its ownership and returns -ENOENT. Explicitly wake
pending_break waiters during close so they can observe the terminal state.

Also prevent ACK and timeout paths from replacing OPLOCK_CLOSING with
OPLOCK_STATE_NONE.

## Remediation

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