{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-22015",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-22015"
  ],
  "published": "2025-04-08T08:16:52Z",
  "summary": "mm/migrate: fix shmem xarray update during migration",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/migrate: fix shmem xarray update during migration\n\nA shmem folio can be either in page cache or in swap cache, but not at the\nsame time.  Namely, once it is in swap cache, folio->mapping should be\nNULL, and the folio is no longer in a shmem mapping.\n\nIn __folio_migrate_mapping(), to determine the number of xarray entries to\nupdate, folio_test_swapbacked() is used, but that conflates shmem in page\ncache case and shmem in swap cache case.  It leads to xarray multi-index\nentry corruption, since it turns a sibling entry to a normal entry during\nxas_store() (see [1] for a userspace reproduction).  Fix it by only using\nfolio_test_swapcache() to determine whether xarray is storing swap cache\nentries or not to choose the right number of xarray entries to update.\n\n[1] https://lore.kernel.org/linux-mm/Z8idPCkaJW1IChjT@casper.infradead.org/\n\nNote:\nIn __split_huge_page(), folio_test_anon() && folio_test_swapcache() is\nused to get swap_cache address space, but that ignores the shmem folio in\nswap cache case.  It could lead to NULL pointer dereferencing when a\nin-swap-cache shmem folio is split at __xa_store(), since\n!folio_test_anon() is true and folio->mapping is NULL.  But fortunately,\nits caller split_huge_page_to_list_to_order() bails out early with EBUSY\nwhen folio->mapping is NULL.  So no need to take care of it here.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-22015"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/49100c0b070e900f87c8fac3be9b9ef8a30fa673"
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      "url": "https://git.kernel.org/stable/c/29124ae980e2860f0eec7355949d3d3292ee81da"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c057ee03f751d6cecf7ee64f52f6545d94082aaa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/75cfb92eb63298d717b6b0118f91ba12c4fcfeb5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60cf233b585cdf1f3c5e52d1225606b86acd08b0"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}