---
id: CVE-2026-99052
title: 'selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts

  When an NFSv4 filesystem exported with security_label is mounted a
  second time, sget_fc() ret…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 <
    a545def625860d4ccedc14fe45e884a62a041cef
  - >-
    Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 <
    a6da93c625b3557dd23ff6db45d2d1bafeae1565
  - >-
    Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 <
    5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b
  - >-
    Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 <
    c997832414f1d846de0a1fa38d7d4f62ba2ea917
  - >-
    Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 <
    28b7260548af3d35773477993ad4e4de41578dd7
  - Linux 3.11
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T12:22:34.168Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99052'
references:
  - url: 'https://git.kernel.org/stable/c/a545def625860d4ccedc14fe45e884a62a041cef'
  - url: 'https://git.kernel.org/stable/c/a6da93c625b3557dd23ff6db45d2d1bafeae1565'
  - url: 'https://git.kernel.org/stable/c/5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b'
  - url: 'https://git.kernel.org/stable/c/c997832414f1d846de0a1fa38d7d4f62ba2ea917'
  - url: 'https://git.kernel.org/stable/c/28b7260548af3d35773477993ad4e4de41578dd7'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.523Z'
---

## Overview

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

selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts

When an NFSv4 filesystem exported with security_label is mounted a
second time, sget_fc() returns the existing superblock and
nfs_get_root() calls security_sb_set_mnt_opts() again on it. Since the
superblock is already SB_INITIALIZED, selinux_set_mnt_opts() takes an
early exit without setting SECURITY_LSM_NATIVE_LABELS in
*set_kern_flags. nfs_get_root() then sees kflags without
SECURITY_LSM_NATIVE_LABELS set and clears NFS_CAP_SECURITY_LABEL on
the shared nfs_server, silently disabling per-file labeling for both
the new and the original mount.

Commit 3815a245b501 ("security/selinux: fix SECURITY_LSM_NATIVE_LABELS
on reused superblock") fixed the same problem in
selinux_sb_clone_mnt_opts().  The reused-superblock path for a plain
second mount now goes through sb_set_mnt_opts rather than
sb_clone_mnt_opts, so it needs the same treatment: on both
SE_SBINITIALIZED early exits, set SECURITY_LSM_NATIVE_LABELS in
*set_kern_flags when the superblock was already using
SECURITY_FS_USE_NATVE.

## Affected

- `Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 < a545def625860d4ccedc14fe45e884a62a041cef`
- `Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 < a6da93c625b3557dd23ff6db45d2d1bafeae1565`
- `Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 < 5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b`
- `Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 < c997832414f1d846de0a1fa38d7d4f62ba2ea917`
- `Linux >= eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 < 28b7260548af3d35773477993ad4e4de41578dd7`
- `Linux 3.11`

## Remediation

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