CVE-2025-40353
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.
Affected versions
Linux kernel versions
6.11
and later are affected. Fixed in
6.12.56,
6.17.6,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40353 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617
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PatchKernel patch commithttps://git.kernel.org/stable/c/5ff5765a1fc526f07d3bbaedb061d970eb13bcf4
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PatchKernel patch commithttps://git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58
Frequently asked questions
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What is CVE-2025-40353?
CVE-2025-40353 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.11 onward and has been patched in 6.12.56, 6.17.6 and 6.18. CVE-2025-40353 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40353?
Yes — CVE-2025-40353 has been patched. Fixed versions include 6.12.56, 6.17.6 and 6.18. If you are running Linux kernel 6.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40353 actively exploited?
No — CVE-2025-40353 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.