---
id: CVE-2026-64360
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  hfs/hfsplus: zero-initialize buffer in hfs_bnode_read

  hfs_bnode_read() can return early without writing to the output buffer
  when is_bnode_offset_valid() fails or when…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  hfs/hfsplus: zero-initialize buffer in hfs_bnode_read

  hfs_bnode_read() can return early without writing to the output buffer
  when is_bnode_offset_valid() fails or when…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-908
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.4.297, < 5.5'
  - 'linux_kernel >= 5.10.241, < 5.10.261'
  - 'linux_kernel >= 5.15.190, < 5.15.212'
  - 'linux_kernel >= 6.1.149, < 6.1.178'
  - 'linux_kernel >= 6.6.103, < 6.6.145'
  - 'linux_kernel >= 6.12.43, < 6.12.96'
  - 'linux_kernel >= 6.15.11, < 6.16'
  - 'linux_kernel >= 6.16.2, < 6.18.39'
  - 'linux_kernel >= 6.19, < 7.1.4'
patched:
  - linux_kernel 7.1.4
published: '2026-07-25'
updated: '2026-09-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64360'
references:
  - url: 'https://git.kernel.org/stable/c/0b189b2204f1a2612dc68f8d139fb5b80539e710'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/16ca053c2be5f4f3044dccf7fc19237dc820d394'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/34684a04777358b2b40ac729e54c8e45359e46b3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8f72fd25a57a457866350359ddd27a43caa62c95'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d2afc7ecee476f9251dd87444f7fb6a424410922'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d5b45bad75cd2730b8452aed4d3b20a2b2a12576'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d67aadee19ffdf3cc8520c5a4f4d5b2916d30baf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f3461b84a4865d9b5e70fbb71da72ae044a3bcd2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00123
epssPercentile: 0.02367
ingestedAt: '2026-09-05T13:39:56.882Z'
---

## Overview

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

hfs/hfsplus: zero-initialize buffer in hfs_bnode_read

hfs_bnode_read() can return early without writing to the output buffer
when is_bnode_offset_valid() fails or when check_and_correct_requested_
length() corrects the length to zero.  Callers such as hfs_bnode_read_
u16() and hfs_bnode_read_u8() pass stack-allocated buffers and use the
result unconditionally, leading to KMSAN uninit-value reports.

Rather than initializing at each individual call site, zero the buffer
at the start of hfs_bnode_read() before any validation checks.  This
ensures all callers in both hfs and hfsplus get a deterministic zero
value regardless of which early-return path is taken.

## Affected

- `linux_kernel >= 5.4.297, < 5.5`
- `linux_kernel >= 5.10.241, < 5.10.261`
- `linux_kernel >= 5.15.190, < 5.15.212`
- `linux_kernel >= 6.1.149, < 6.1.178`
- `linux_kernel >= 6.6.103, < 6.6.145`
- `linux_kernel >= 6.12.43, < 6.12.96`
- `linux_kernel >= 6.15.11, < 6.16`
- `linux_kernel >= 6.16.2, < 6.18.39`
- `linux_kernel >= 6.19, < 7.1.4`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.1.4`