---
id: CVE-2026-98907
title: 'btrfs: protect sb_write_pointer() with invalidate lock'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  btrfs: protect sb_write_pointer() with invalidate lock

  sb_write_pointer() reads the super block from the block device page cache
  using read_cache_page_gfp(). This has …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3c20917120ce61f2a123ca0810293872f4c6b5a4 <
    80cd97c5e90096d040a623851795eac92fbd0ff1
  - >-
    Linux >= 3c20917120ce61f2a123ca0810293872f4c6b5a4 <
    123b9a545f4d0348e81f558a032bf2a93ee5722f
  - Linux 6.15
published: '2026-10-23'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T06:56:36.536Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98907'
references:
  - url: 'https://git.kernel.org/stable/c/80cd97c5e90096d040a623851795eac92fbd0ff1'
  - url: 'https://git.kernel.org/stable/c/123b9a545f4d0348e81f558a032bf2a93ee5722f'
  - url: 'https://git.kernel.org/stable/c/c9b38f2eab5a9bd74087390318d93ccdd8d2deff'
  - url: 'https://git.kernel.org/stable/c/a0dc28359a8a26f970ccd250b126a2e0bd4118a5'
  - url: 'https://git.kernel.org/stable/c/1a6c92aa7242a04e4349c0ea213dbf703a1c9891'
  - url: 'https://git.kernel.org/stable/c/a58cab4535f085adc0f93d7efd7952ef437371da'
tags:
  - cve.org
epss: 0.00161
epssPercentile: 0.05258
ingestedAt: '2026-10-23T13:24:55.574Z'
---

## Overview

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

btrfs: protect sb_write_pointer() with invalidate lock

sb_write_pointer() reads the super block from the block device page cache
using read_cache_page_gfp(). This has the same race with BLKBSZSET as the
one fixed by commit 3f29d661e568 ("btrfs: sync read disk super and set
block size").

Take the mapping invalidate lock around read_cache_page_gfp() to
serialize the read against block size changes.

## Affected

- `Linux >= 3c20917120ce61f2a123ca0810293872f4c6b5a4 < 80cd97c5e90096d040a623851795eac92fbd0ff1`
- `Linux >= 3c20917120ce61f2a123ca0810293872f4c6b5a4 < 123b9a545f4d0348e81f558a032bf2a93ee5722f`
- `Linux 6.15`

## Remediation

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