---
id: CVE-2026-64392
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: use opener credentials for delete-on-close

  Delete-on-close can be completed by deferred or durable handle teardown,
  where no request work is available
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: use opener credentials for delete-on-close

  Delete-on-close can be completed by deferred or durable handle teardown,
  where no request work is available. Both the…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.15, < 6.6.145'
  - 'linux_kernel >= 6.7, < 6.12.96'
  - 'linux_kernel >= 6.13, < 6.18.39'
  - 'linux_kernel >= 6.19, < 7.1.4'
patched:
  - linux_kernel 7.1.4
published: '2026-07-25'
updated: '2026-09-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64392'
references:
  - url: 'https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00469
epssPercentile: 0.37856
ingestedAt: '2026-09-05T13:39:57.522Z'
---

## Overview

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

ksmbd: use opener credentials for delete-on-close

Delete-on-close can be completed by deferred or durable handle teardown,
where no request work is available. Both the base-file unlink and the ADS
xattr removal consequently run with the ksmbd worker credentials and can
bypass filesystem permission checks.

Run both operations with the credentials captured in struct file when the
handle was opened. This preserves the authenticated user's fsuid, fsgid,
supplementary groups and capability restrictions at final close.

## Affected

- `linux_kernel >= 5.15, < 6.6.145`
- `linux_kernel >= 6.7, < 6.12.96`
- `linux_kernel >= 6.13, < 6.18.39`
- `linux_kernel >= 6.19, < 7.1.4`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.1.4`