---
id: CVE-2026-43359
title: 'btrfs: fix transaction abort on set received ioctl due to item overflow'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  btrfs: fix transaction abort on set received ioctl due to item overflow

  If the set received ioctl fails due to an item overflow when attempting to
  add the BTRFS_UUID_K…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 <
    b9914db13ac15aca3b74544c0bb1a2e0dad1f174
  - >-
    Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 <
    b19c0465e4daad5aa8f60552ea0578cf31a11b1e
  - >-
    Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 <
    2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5
  - >-
    Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 <
    d11aefe654a04fc41996d254748d6a38b6b0a7be
  - >-
    Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 <
    41fb97353ff58fa4f31904c343fc8e3df2f7517d
  - >-
    Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 <
    87f2c46003fce4d739138aab4af1942b1afdadac
  - Linux 3.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:36:21.571725Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:50.278Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43359'
references:
  - url: 'https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174'
  - url: 'https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e'
  - url: 'https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5'
  - url: 'https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be'
  - url: 'https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d'
  - url: 'https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02041
ingestedAt: '2026-11-06T15:54:03.932Z'
---

## Overview

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

btrfs: fix transaction abort on set received ioctl due to item overflow

If the set received ioctl fails due to an item overflow when attempting to
add the BTRFS_UUID_KEY_RECEIVED_SUBVOL we have to abort the transaction
since we did some metadata updates before.

This means that if a user calls this ioctl with the same received UUID
field for a lot of subvolumes, we will hit the overflow, trigger the
transaction abort and turn the filesystem into RO mode. A malicious user
could exploit this, and this ioctl does not even requires that a user
has admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.

Fix this by doing an early check for item overflow before starting a
transaction. This is also race safe because we are holding the subvol_sem
semaphore in exclusive (write) mode.

A test case for fstests will follow soon.

## Affected

- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < b9914db13ac15aca3b74544c0bb1a2e0dad1f174`
- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < b19c0465e4daad5aa8f60552ea0578cf31a11b1e`
- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5`
- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < d11aefe654a04fc41996d254748d6a38b6b0a7be`
- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 41fb97353ff58fa4f31904c343fc8e3df2f7517d`
- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 87f2c46003fce4d739138aab4af1942b1afdadac`
- `Linux 3.12`

## Remediation

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