{
  "cveId": "CVE-2025-39899",
  "url": "https://patchblox.com/security/cve/CVE-2025-39899",
  "summary": "CVE-2025-39899 is fixed in 70 products on 1 platform, first by ALAS2023-2025-1208, released September 23, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/userfaultfd: fix kmap_local LIFO ordering for...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/userfaultfd: fix kmap_local LIFO ordering for CONFIG_HIGHPTE  With CONFIG_HIGHPTE on 32-bit ARM, move_pages_pte() maps PTE pages using kmap_local_page(), which requires unmapping in Last-In-First-Out order.  The current code maps dst_pte first, then src_pte, but unmaps them in the same order (dst_pte, src_pte), violating the LIFO requirement.  This causes the warning in kunmap_local_indexed():    WARNING: CPU: 0 PID: 604 at mm/highmem.c:622 kunmap_local_indexed\u002B0x178/0x17c   addr \\!= __fix_to_virt(FIX_KMAP_BEGIN \u002B idx)  Fix this by reversing the unmap order to respect LIFO ordering.  This issue follows the same pattern as similar fixes: - commit eca6828403b8 (\u0022crypto: skcipher - fix mismatch between mapping and unmapping order\u0022) - commit 8cf57c6df818 (\u0022nilfs2: eliminate staggered calls to kunmap in nilfs_rename\u0022)  Both of which addressed the same fundamental requirement that kmap_local operations must follow LIFO ordering.",
  "published": "2025-09-23T23:15:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00146,
  "epssPercentile": 0.03898,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "product": "python3-perf6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.46-66.121.amzn2023",
      "fix": "ALAS2023-2025-1208",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1208",
      "released": "2025-09-23T23:15:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.46-66.121.amzn2023",
      "fix": "ALAS2023-2025-1208",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1208",
      "released": "2025-09-23T23:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}