---
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 >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <
    17699905a381621c1cee5b6528feb05acedc86a4
  - >-
    Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <
    3251ea36df5eef58aa207fbee48849d89b922ea6
  - >-
    Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <
    fba4653a0b4dc2f6d42600abe21fb326292f70ff
  - >-
    Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <
    5015191096db311759fef98769270336cd8b1324
  - Linux 5.15
published: '2026-10-23'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T06:56:29.179Z'
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
epss: 0.00174
epssPercentile: 0.06826
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 >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 17699905a381621c1cee5b6528feb05acedc86a4`
- `Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 3251ea36df5eef58aa207fbee48849d89b922ea6`
- `Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < fba4653a0b4dc2f6d42600abe21fb326292f70ff`
- `Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 5015191096db311759fef98769270336cd8b1324`
- `Linux 5.15`

## Remediation

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