{
  "cveId": "CVE-2025-40353",
  "url": "https://patchblox.com/security/cve/CVE-2025-40353",
  "summary": "CVE-2025-40353 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-40353, released December 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "arm64: 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 (\u0022mm: migrate: support poisoned recover from migrate folio\u0022), 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.",
  "published": "2025-12-16T14:15:47Z",
  "severity": "Low",
  "cvss": 4,
  "epss": 0.00199,
  "epssPercentile": 0.09754,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40353",
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