---
id: CVE-2025-40353
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  arm64: mte: Do not warn if the page is already tagged in copy_highpage()

  The arm64 copy_highpage() assumes that the destination page is newly
  allocated and not MTE-tag…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  arm64: mte: Do not warn if the page is already tagged in copy_highpage()

  The arm64 copy_highpage() assumes that the destination page is newly
  allocated and not MTE-tag…
severity: none
published: '2025-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40353'
references:
  - url: 'https://git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5ff5765a1fc526f07d3bbaedb061d970eb13bcf4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00199
epssPercentile: 0.08999
ingestedAt: '2026-10-14T13:30:58.438Z'
---

## Overview

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

arm64: mte: Do not warn if the page is already tagged in copy_highpage()

The arm64 copy_highpage() assumes that the destination page is newly
allocated and not MTE-tagged (PG_mte_tagged unset) and warns
accordingly. However, following commit 060913999d7a ("mm: migrate:
support poisoned recover from migrate folio"), folio_mc_copy() is called
before __folio_migrate_mapping(). If the latter fails (-EAGAIN), the
copy will be done again to the same destination page. Since
copy_highpage() already set the PG_mte_tagged flag, this second copy
will warn.

Replace the WARN_ON_ONCE(page already tagged) in the arm64
copy_highpage() with a comment.

## Remediation

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