---
id: CVE-2026-97561
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid

  When the administrator mounts with forceuid or forcegid (uid=/gid=
  mount options), they expect all fi…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid

  When the administrator mounts with forceuid or forcegid (uid=/gid=
  mount options), they expect all fi…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    e1b74f8f8c1d13190b09fe623b729d36b7ac22a8
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    18a72975e9f35aadecc75b031f693f2d1f49308f
  - Linux < 7.2.7
  - Linux (all versions)
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:06.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97561'
references:
  - url: 'https://git.kernel.org/stable/c/18a72975e9f35aadecc75b031f693f2d1f49308f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e1b74f8f8c1d13190b09fe623b729d36b7ac22a8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.915Z'
---

## Overview

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

smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid

When the administrator mounts with forceuid or forcegid (uid=/gid=
mount options), they expect all files to appear owned by the specified
user/group.  However, several code paths unconditionally called
sid_to_id() to overwrite cf_uid/cf_gid with server-provided values,
ignoring the administrator's explicit override:

  - smb311_posix_info_to_fattr() (stat via POSIX extensions)
  - cifs_posix_to_fattr() (readdir via POSIX extensions)
  - parse_sec_desc() (CIFS ACL ownership mapping)

This allowed an untrusted server to dictate local file ownership even
when the mount was configured to force specific uid/gid values.

Fix all three call sites to check CIFS_MOUNT_OVERR_UID and
CIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the
same pattern already used by cifs_unix_basic_to_fattr() for unix
extensions.

## Remediation

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