BaseFortify

Publication date: 2025-12-16

Last updated on: 2025-12-18

Assigner: kernel.org

Description

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.

CVSS Scores

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Meta Information

Published

2025-12-16

Last Modified

2025-12-18

Generated

2026-07-06

AI Q&A

2025-12-16

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40353

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability involves the arm64 architecture in the Linux kernel where the copy_highpage() function incorrectly warns if a memory page is already tagged with MTE (Memory Tagging Extension). The function assumes the destination page is newly allocated and not tagged, but due to changes in the kernel's memory migration process, the same page can be copied to multiple times, causing unnecessary warnings. The fix removes this warning to prevent false alerts.

Impact Analysis

The impact of this vulnerability is primarily related to misleading warnings during memory page copying on arm64 systems. It does not cause incorrect behavior or security issues but may cause confusion or unnecessary log noise for developers or system administrators monitoring kernel messages.

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