CVE-2025-40353 Details
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.
A vulnerability in the Linux kernel's handling of memory tagging extensions (MTE) on arm64 architecture has been addressed. The issue arose in the 'copy_highpage()' function, which incorrectly assumed that the destination page was newly allocated and not MTE-tagged. This assumption led to unnecessary warnings when the page was reused during the migration process. The vulnerability has been resolved by modifying the warning mechanism to prevent false alerts without compromising the integrity of the page copying process.
Users can upgrade to the latest version of the Linux kernel stable tree to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Dec 16, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/5ff5765a1fc526f07d3bbaedb061d970eb13bcf4 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58 | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | ~6.12 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Dec 16, 2025 | New CVE Received | kernel.org |