---
id: CVE-2026-100073
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ext4: fix transaction overflow during writeback

  Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent
  conversion") was correct to note that we need to re…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ext4: fix transaction overflow during writeback

  Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent
  conversion") was correct to note that we need to re…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 95ad8ee45cdbc321c135a2db895d48b374ef0f87 <
    a22464c5df5827e884a5a7d3d8fb03870e5bb6c8
  - >-
    Linux >= 95ad8ee45cdbc321c135a2db895d48b374ef0f87 <
    46e8e31771f4f1c5e1cdec37a889a6730e42e9f1
  - Linux 2b6d39229bc783198222cddd31e2fbded93c8db7
  - Linux >= 6.16.3 < 6.17
  - Linux 6.17
published: '2026-09-25'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T14:10:59.253'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100073'
references:
  - url: 'https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100073.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-100073'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541430'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-100073'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100073'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-100073.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.001
epssPercentile: 0.00858
ingestedAt: '2026-09-25T14:09:46.376Z'
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-617
---

## Overview

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

ext4: fix transaction overflow during writeback

Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent
conversion") was correct to note that we need to reserve enough credits
for all extents possibly underlying a large folio. However it was too
eager to reduce the number of reserved credits. Extent conversion may
not only need to touch several leaf extent blocks, it may also need to
split extents - for example a single large unwritten extent may need to
be split into many small written ones in case of sparse folio dirtying.
This can thus result not only in extent leaf modifications but also in a
need to allocate new extent tree nodes. As a result the reserved
transaction credits were not sufficient in some corner cases. Use
ext4_meta_trans_blocks() for correct upper bound credit estimate.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100073.json)