---
id: CVE-2026-98879
title: 'isofs: handle set_blocksize failures'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  isofs: handle set_blocksize failures

  isofs uses buffer_heads, which don't handle block size > PAGE_SIZE well.
  Without this, mounting we will hit the

          BUG_ON(of…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    6db7f0ba365786304558db6a3d52013ae176e03e
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    61f277bf35f533b602984f0e55900111fe52f31a
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    cebde6d88e34396c29f2f001d90e921677cc17d6
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    28d1f6aa14f5924e36602b7a31c9141d34de0b9c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9c97e3b1152d3092581745189f5d2f04c6404ef9
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9584ab6283721e5aab485c79bd06c2f78d89e55c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32
  - Linux < 5.10.271
  - Linux < 5.15.222
  - Linux < 6.1.189
  - Linux < 6.6.158
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T11:37:28.048Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98879'
references:
  - url: 'https://git.kernel.org/stable/c/6db7f0ba365786304558db6a3d52013ae176e03e'
  - url: 'https://git.kernel.org/stable/c/61f277bf35f533b602984f0e55900111fe52f31a'
  - url: 'https://git.kernel.org/stable/c/cebde6d88e34396c29f2f001d90e921677cc17d6'
  - url: 'https://git.kernel.org/stable/c/28d1f6aa14f5924e36602b7a31c9141d34de0b9c'
  - url: 'https://git.kernel.org/stable/c/9c97e3b1152d3092581745189f5d2f04c6404ef9'
  - url: 'https://git.kernel.org/stable/c/9584ab6283721e5aab485c79bd06c2f78d89e55c'
  - url: 'https://git.kernel.org/stable/c/25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.581Z'
---

## Overview

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

isofs: handle set_blocksize failures

isofs uses buffer_heads, which don't handle block size > PAGE_SIZE well.
Without this, mounting we will hit the

        BUG_ON(offset >= folio_size(folio));

in folio_set_bh on the first __bread_gfp call.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6db7f0ba365786304558db6a3d52013ae176e03e`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 61f277bf35f533b602984f0e55900111fe52f31a`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cebde6d88e34396c29f2f001d90e921677cc17d6`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 28d1f6aa14f5924e36602b7a31c9141d34de0b9c`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9c97e3b1152d3092581745189f5d2f04c6404ef9`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9584ab6283721e5aab485c79bd06c2f78d89e55c`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32`
- `Linux < 5.10.271`
- `Linux < 5.15.222`
- `Linux < 6.1.189`
- `Linux < 6.6.158`
- `Linux < 6.12.111`
- `Linux < 6.18.53`
- `Linux (all versions)`

## Remediation

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