---
id: CVE-2026-89834
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  f2fs: fix to migrate all curseg types during free_segment_range

  In free_segment_range(), the curseg evacuation loop only iterates up to
  NR_CURSEG_PERSIST_TYPE (0..5), …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  f2fs: fix to migrate all curseg types during free_segment_range

  In free_segment_range(), the curseg evacuation loop only iterates up to
  NR_CURSEG_PERSIST_TYPE (0..5), …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <
    3b85edf3391f3e1f624f409a7d2d239885f567b7
  - >-
    Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <
    b8ae1228c153622afa71a179c9d4dc268117e0f0
  - >-
    Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <
    b9776094aa7118e8e5dfdcd791ffc8330c5ca408
  - >-
    Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <
    8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1
  - Linux 5.10
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:16:50.180'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89834'
references:
  - url: 'https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.999Z'
epss: 0.00209
epssPercentile: 0.0977
---

## Overview

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

f2fs: fix to migrate all curseg types during free_segment_range

In free_segment_range(), the curseg evacuation loop only iterates up to
NR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg
types such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC.

Even though these in-memory curseg types are not saved in the on-disk
checkpoint header, they still occupy active physical segments at runtime.
If an active in-memory curseg happens to be allocated within the segment
range being truncated during filesystem shrink, failing to evacuate it
will cause subsequent writes to the curseg attempting out-of-bounds I/O
on the truncated storage range.

Fix this by expanding the curseg evacuation loop upper bound to
NR_CURSEG_TYPE to ensure all active curseg types are safely migrated
out of the target range.

## Remediation

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