---
id: CVE-2026-93786
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: preserve VFS inherited POSIX ACL mask

  The VFS initializes a child's POSIX ACL from the parent's default ACL and
  the requested creation mode
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: preserve VFS inherited POSIX ACL mask

  The VFS initializes a child's POSIX ACL from the parent's default ACL and
  the requested creation mode. Do not mutate the p…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f44158485826c076335d6860d35872271a83791d <
    4a19bb1c45667f5a5f6eff9cf6648e0f692d046f
  - >-
    Linux >= f44158485826c076335d6860d35872271a83791d <
    591acf171644de590cda245fd8595b473a1beb70
  - >-
    Linux >= f44158485826c076335d6860d35872271a83791d <
    0093909becbda22b62b39b654dbc607faed59cd0
  - >-
    Linux >= f44158485826c076335d6860d35872271a83791d <
    e148e567a9252643baa125cb65d7ae9c2c6cf68a
  - Linux 5.15
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:48.163'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93786'
references:
  - url: 'https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00341
epssPercentile: 0.27461
ingestedAt: '2026-09-24T16:47:15.903Z'
---

## Overview

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

ksmbd: preserve VFS inherited POSIX ACL mask

The VFS initializes a child's POSIX ACL from the parent's default ACL and
the requested creation mode. Do not mutate the parent ACL or overwrite the
child's VFS-computed access and default ACLs afterwards.

This preserves restrictive ACL_MASK entries and prevents SMB object creation
from widening effective permissions.

## Remediation

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