---
id: CVE-2026-98901
title: 'ksmbd: fix lease break and ack state handling'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix lease break and ack state handling

  Do not skip valid lease states containing WRITE_CACHING when breaking
  level-II/read leases for writes and truncates.

  Han…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    17699905a381621c1cee5b6528feb05acedc86a4
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3251ea36df5eef58aa207fbee48849d89b922ea6
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    fba4653a0b4dc2f6d42600abe21fb326292f70ff
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    5015191096db311759fef98769270336cd8b1324
  - Linux < 6.6.158
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T11:54:11.554Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98901'
references:
  - url: 'https://git.kernel.org/stable/c/17699905a381621c1cee5b6528feb05acedc86a4'
  - url: 'https://git.kernel.org/stable/c/3251ea36df5eef58aa207fbee48849d89b922ea6'
  - url: 'https://git.kernel.org/stable/c/fba4653a0b4dc2f6d42600abe21fb326292f70ff'
  - url: 'https://git.kernel.org/stable/c/5015191096db311759fef98769270336cd8b1324'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.575Z'
---

## Overview

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

ksmbd: fix lease break and ack state handling

Do not skip valid lease states containing WRITE_CACHING when breaking
level-II/read leases for writes and truncates.

Handle lease break acknowledgments according to the SMB2 rule that the
acknowledged state must be a subset of the server's break target. Apply
the acknowledged state directly and keep the break pending on failed ACKs.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 17699905a381621c1cee5b6528feb05acedc86a4`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3251ea36df5eef58aa207fbee48849d89b922ea6`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fba4653a0b4dc2f6d42600abe21fb326292f70ff`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5015191096db311759fef98769270336cd8b1324`
- `Linux < 6.6.158`
- `Linux < 6.12.111`
- `Linux < 6.18.53`
- `Linux (all versions)`

## Remediation

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