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

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Summary

CVECVE-2025-40353
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-16 14:15:47 UTC
Updated2026-10-14 13:10:00 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 060913999d7a9e50c283fdb15253fc27974ddadc 5ff5765a1fc526f07d3bbaedb061d970eb13bcf4 git Not specified
CNA Linux Linux affected 060913999d7a9e50c283fdb15253fc27974ddadc 0bbf3fc6e9211fce9889fe8efbb89c220504d617 git Not specified
CNA Linux Linux affected 060913999d7a9e50c283fdb15253fc27974ddadc b98c94eed4a975e0c80b7e90a649a46967376f58 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.12.56 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.6 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5ff5765a1fc526f07d3bbaedb061d970eb13bcf4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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