---
id: CVE-2026-68343
title: 'smb: client: validate DFS referral PathConsumed'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: validate DFS referral PathConsumed

  parse_dfs_referrals() validates that the response contains the fixed
  referral entry array and, on for-next, the per-ref…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad <
    bfebe5110fd135d86d65a0a346e14c106b02028b
  - >-
    Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad <
    5b439f39f33ec15d319ced3b025e122346fba987
  - >-
    Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad <
    285bd4a5f3f156aa5869843b47a1b1380b774241
  - >-
    Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad <
    2fdd6d196c656b376cc251e1e9ff110b3ed522e1
  - >-
    Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad <
    9f88a99ed511651b2dc2177d6854b2d1b8322e75
  - >-
    Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad <
    f6f5ee2aa33b350c671721b965251c42cebb962e
  - Linux 4.11
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:47:19.145050Z'
published: '2026-08-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:53:08.866Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68343'
references:
  - url: 'https://git.kernel.org/stable/c/bfebe5110fd135d86d65a0a346e14c106b02028b'
  - url: 'https://git.kernel.org/stable/c/5b439f39f33ec15d319ced3b025e122346fba987'
  - url: 'https://git.kernel.org/stable/c/285bd4a5f3f156aa5869843b47a1b1380b774241'
  - url: 'https://git.kernel.org/stable/c/2fdd6d196c656b376cc251e1e9ff110b3ed522e1'
  - url: 'https://git.kernel.org/stable/c/9f88a99ed511651b2dc2177d6854b2d1b8322e75'
  - url: 'https://git.kernel.org/stable/c/f6f5ee2aa33b350c671721b965251c42cebb962e'
tags:
  - cve.org
epss: 0.00513
epssPercentile: 0.42408
ingestedAt: '2026-10-16T17:24:46.861Z'
---

## Overview

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

smb: client: validate DFS referral PathConsumed

parse_dfs_referrals() validates that the response contains the fixed
referral entry array and, on for-next, the per-referral string offsets.
However, the response also contains a PathConsumed value that is later
used for DFS path parsing.

If a malformed response provides a PathConsumed value larger than the
search name, later DFS parsing can advance beyond the end of the path.

Validate PathConsumed against the search name length before storing it in
the parsed referral.

## Affected

- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < bfebe5110fd135d86d65a0a346e14c106b02028b`
- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 5b439f39f33ec15d319ced3b025e122346fba987`
- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 285bd4a5f3f156aa5869843b47a1b1380b774241`
- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 2fdd6d196c656b376cc251e1e9ff110b3ed522e1`
- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 9f88a99ed511651b2dc2177d6854b2d1b8322e75`
- `Linux >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < f6f5ee2aa33b350c671721b965251c42cebb962e`
- `Linux 4.11`

## Remediation

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