---
id: CVE-2026-53381
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  virtiofs: fix UAF on submount umount

  iput() called from fuse_release_end() can Oops if the super block has
  already been destroyed
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  virtiofs: fix UAF on submount umount

  iput() called from fuse_release_end() can Oops if the super block has
  already been destroyed.  Normally this is prevented by waiti…
severity: none
published: '2026-07-19'
updated: '2026-07-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53381'
references:
  - url: 'https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
ingestedAt: '2026-07-19T16:31:24.351Z'
epss: 0.00139
epssPercentile: 0.02649
---

## Overview

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

virtiofs: fix UAF on submount umount

iput() called from fuse_release_end() can Oops if the super block has
already been destroyed.  Normally this is prevented by waiting for
num_waiting to go down to zero before commencing with super block shutdown.

This only works, however, for the last submount instance, as the wait
counter is per connection, not per superblock.

Revert to using synchronous release requests for the auto_submounts case,
which is virtiofs only at this time.

## Remediation

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