CVE-2025-40353 (GCVE-0-2025-40353)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:30 – Updated: 2025-12-16 13:30
VLAI?
Title
arm64: mte: Do not warn if the page is already tagged in copy_highpage()
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ff5765a1fc526f07d3bbaedb061d970eb13bcf4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0bbf3fc6e9211fce9889fe8efbb89c220504d617 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b98c94eed4a975e0c80b7e90a649a46967376f58 (git)
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    Linux Linux Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/mm/copypage.c"
          ],
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          "vendor": "Linux",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mte: Do not warn if the page is already tagged in copy_highpage()\n\nThe arm64 copy_highpage() assumes that the destination page is newly\nallocated and not MTE-tagged (PG_mte_tagged unset) and warns\naccordingly. However, following commit 060913999d7a (\"mm: migrate:\nsupport poisoned recover from migrate folio\"), folio_mc_copy() is called\nbefore __folio_migrate_mapping(). If the latter fails (-EAGAIN), the\ncopy will be done again to the same destination page. Since\ncopy_highpage() already set the PG_mte_tagged flag, this second copy\nwill warn.\n\nReplace the WARN_ON_ONCE(page already tagged) in the arm64\ncopy_highpage() with a comment."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:30:26.273Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617"
        },
        {
          "url": "https://git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58"
        }
      ],
      "title": "arm64: mte: Do not warn if the page is already tagged in copy_highpage()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40353",
    "datePublished": "2025-12-16T13:30:26.273Z",
    "dateReserved": "2025-04-16T07:20:57.187Z",
    "dateUpdated": "2025-12-16T13:30:26.273Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40353\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:47.203\",\"lastModified\":\"2025-12-18T15:08:25.907\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: mte: Do not warn if the page is already tagged in copy_highpage()\\n\\nThe arm64 copy_highpage() assumes that the destination page is newly\\nallocated and not MTE-tagged (PG_mte_tagged unset) and warns\\naccordingly. However, following commit 060913999d7a (\\\"mm: migrate:\\nsupport poisoned recover from migrate folio\\\"), folio_mc_copy() is called\\nbefore __folio_migrate_mapping(). If the latter fails (-EAGAIN), the\\ncopy will be done again to the same destination page. Since\\ncopy_highpage() already set the PG_mte_tagged flag, this second copy\\nwill warn.\\n\\nReplace the WARN_ON_ONCE(page already tagged) in the arm64\\ncopy_highpage() with a comment.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ff5765a1fc526f07d3bbaedb061d970eb13bcf4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Detection rules are retrieved from Rulezet.