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CVE-2025-40353arm64: mte: Do not warn if the page is already tagged in copy_highpage()

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.

Timeline

  1. ID reserved

    By Linux

  2. · 8 months later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.

EPSS (exploitation in 30 days)
0.20% · top 90% of all CVEs (14 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected 060913999d7a9e50c283fdb15253fc27974ddadc – < 5ff5765a1fc526f07d3bbaedb061d970eb13bcf4
    • affected 060913999d7a9e50c283fdb15253fc27974ddadc – < 0bbf3fc6e9211fce9889fe8efbb89c220504d617
    • affected 060913999d7a9e50c283fdb15253fc27974ddadc – < b98c94eed4a975e0c80b7e90a649a46967376f58

  • Linux · Linux

    • affected 6.11
    • unaffected < 6.11
    • unaffected 6.12.56 – ≤ 6.12.*
    • unaffected 6.17.6 – ≤ 6.17.*
    • unaffected 6.18 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .