---
id: CVE-2026-90161
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  erofs: fix interlaced ztailpacking pclusters

  On-disk sizes of interlaced pclusters should be block-aligned, and
  ztailpacking interlaced pclusters should be invalid at …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  erofs: fix interlaced ztailpacking pclusters

  On-disk sizes of interlaced pclusters should be block-aligned, and
  ztailpacking interlaced pclusters should be invalid at …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fdffc091e6f94602558bba712b51bc16f79fd6d5 <
    ddb7ea4fd99bf6c4314d1dfca18aec6945ce8054
  - >-
    Linux >= fdffc091e6f94602558bba712b51bc16f79fd6d5 <
    451027c642e752420e1a04237db9ce7b35cee595
  - >-
    Linux >= fdffc091e6f94602558bba712b51bc16f79fd6d5 <
    862427ebb81d1f6abbf74d799790e1694b37b187
  - Linux 7d6ef8277e44c22f894d54d26ddb36c22d60712d
  - Linux >= 6.0.16 < 6.1
  - Linux 6.1
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:44.697'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90161'
references:
  - url: 'https://git.kernel.org/stable/c/451027c642e752420e1a04237db9ce7b35cee595'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/862427ebb81d1f6abbf74d799790e1694b37b187'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ddb7ea4fd99bf6c4314d1dfca18aec6945ce8054'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00175
epssPercentile: 0.06137
ingestedAt: '2026-09-17T16:21:47.872Z'
---

## Overview

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

erofs: fix interlaced ztailpacking pclusters

On-disk sizes of interlaced pclusters should be block-aligned, and
ztailpacking interlaced pclusters should be invalid at all.

Currently, mkfs.erofs won't generate any interlaced pcluster with
ztailpacking enabled, so this doesn't affect any existing valid
filesystems.

However, crafted images can contain invalid interlaced ztailpacking
pclusters, resulting in an out-of-bounds read from a kmap'd page and
copying irrelevant kernel memory into userspace-visible page cache.

## Remediation

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