---
id: CVE-2026-90169
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: free preauth sessions on connection teardown

  SMB3.1.1 multichannel binding preserves the preauthentication hash in a
  preauth_session between the NTLM negotiate …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: free preauth sessions on connection teardown

  SMB3.1.1 multichannel binding preserves the preauthentication hash in a
  preauth_session between the NTLM negotiate …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f5a544e3bab78142207e0242d22442db85ba1eff <
    effcf48d79d8aa53113d8289e140746f25ceb62c
  - >-
    Linux >= f5a544e3bab78142207e0242d22442db85ba1eff <
    b62b1ebb25f0a19067ed5b1a86036b2dc98be44f
  - >-
    Linux >= f5a544e3bab78142207e0242d22442db85ba1eff <
    a41a98ee16ae038751b6639decadaa3ce15ca18a
  - >-
    Linux >= f5a544e3bab78142207e0242d22442db85ba1eff <
    8e2ebc77678832e981adc008d25cd8f67d08ebc4
  - >-
    Linux >= f5a544e3bab78142207e0242d22442db85ba1eff <
    06c7b1d731bc105a8644f1b70165ba8b9416cbab
  - Linux 5.15
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:10.333'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90169'
references:
  - url: 'https://git.kernel.org/stable/c/06c7b1d731bc105a8644f1b70165ba8b9416cbab'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8e2ebc77678832e981adc008d25cd8f67d08ebc4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a41a98ee16ae038751b6639decadaa3ce15ca18a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b62b1ebb25f0a19067ed5b1a86036b2dc98be44f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/effcf48d79d8aa53113d8289e140746f25ceb62c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.870Z'
epss: 0.0024
epssPercentile: 0.13483
---

## Overview

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

ksmbd: free preauth sessions on connection teardown

SMB3.1.1 multichannel binding preserves the preauthentication hash in a
preauth_session between the NTLM negotiate and authenticate requests.
The binding NTLM negotiate allocates this object and returns
STATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends
the authenticate request, neither the authenticate nor error cleanup paths
free the object.

Release any remaining preauthentication sessions when tearing down the
connection. Initialize the list when allocating the connection so that this
cleanup is safe regardless of the negotiated dialect.

## Remediation

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