---
id: CVE-2026-93269
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ext4: fix circular lock dependency in ext4_ext_migrate

  Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a
  circular lock dependency between s_writepages_r…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ext4: fix circular lock dependency in ext4_ext_migrate

  Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a
  circular lock dependency between s_writepages_r…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= cb85f4d23f794e24127f3e562cb3b54b0803f456 <
    452950461241dfed8b1d32e94b227db38c99c5af
  - >-
    Linux >= cb85f4d23f794e24127f3e562cb3b54b0803f456 <
    ada23457d4748d6e9c36c6f871fc29a6f558c48c
  - >-
    Linux >= cb85f4d23f794e24127f3e562cb3b54b0803f456 <
    e4223231b6860141813637a6413c2371ae4d6fa8
  - >-
    Linux >= cb85f4d23f794e24127f3e562cb3b54b0803f456 <
    32f7ab52875ec7f800ca67e7176e5743a84baddf
  - >-
    Linux >= cb85f4d23f794e24127f3e562cb3b54b0803f456 <
    a897682793eba5de51ee6f3152760374afa629cf
  - Linux eb799e163dc2bc1ea0a4820b66f79d32a5e907df
  - Linux bcc1eab71a67c46b9e24544ac7923f44444174ce
  - Linux 8cf20fb73e73a4c4df0328b5297842c5ef34fdd9
  - Linux e5d25003d059649e18a249635ed5ca7a7b1de5ad
  - Linux 69f8a7991fd93c49096ddd11574db3e7df238b7b
  - Linux >= 4.9.215 < 4.10
  - Linux >= 4.14.172 < 4.15
  - Linux >= 4.19.107 < 4.20
  - Linux >= 5.4.23 < 5.5
  - Linux >= 5.5.7 < 5.6
  - Linux 5.6
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T16:17:23.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93269'
references:
  - url: 'https://git.kernel.org/stable/c/32f7ab52875ec7f800ca67e7176e5743a84baddf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5af'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T16:47:15.838Z'
---

## Overview

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

ext4: fix circular lock dependency in ext4_ext_migrate

Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a
circular lock dependency between s_writepages_rwsem and sb_internal
(freeze protection).

The deadlock scenario:

  CPU0 (EXT4_IOC_MIGRATE)        CPU1 (orphan cleanup during mount)
  ----                           ----
  ext4_ext_migrate()
    ext4_writepages_down_write()
      s_writepages_rwsem (write)
                                 ext4_evict_inode()
                                   sb_start_intwrite()   [sb_internal]
                                   ...
                                     ext4_writepages()
                                       s_writepages_rwsem (read) [BLOCKED]
    iput(tmp_inode)
      ext4_evict_inode()
        sb_start_intwrite()         [BLOCKED]

The tmp_inode is a temporary inode with nlink=0 created solely for
building the extent tree.  Its eviction does not require
s_writepages_rwsem protection, so deferring iput() until after
releasing the rwsem is safe.

## Remediation

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