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Unrated severityNVD Advisory· Published Dec 16, 2025· Updated Apr 15, 2026

CVE-2025-40353

CVE-2025-40353

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.

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Affected products

42

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