{
  "cveId": "CVE-2025-39961",
  "url": "https://patchblox.com/security/cve/CVE-2025-39961",
  "summary": "CVE-2025-39961 is fixed in 53 products on 1 platform, first by DEBIAN-CVE-2025-39961, released October 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "iommu/amd/pgtbl: Fix possible race while increase page table level",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  iommu/amd/pgtbl: Fix possible race while increase page table level  The AMD IOMMU host page table implementation supports dynamic page table levels (up to 6 levels), starting with a 3-level configuration that expands based on IOVA address. The kernel maintains a root pointer and current page table level to enable proper page table walks in alloc_pte()/fetch_pte() operations.  The IOMMU IOVA allocator initially starts with 32-bit address and onces its exhuasted it switches to 64-bit address (max address is determined based on IOMMU and device DMA capability). To support larger IOVA, AMD IOMMU driver increases page table level.  But in unmap path (iommu_v1_unmap_pages()), fetch_pte() reads pgtable-\u003E[root/mode] without lock. So its possible that in exteme corner case, when increase_address_space() is updating pgtable-\u003E[root/mode], fetch_pte() reads wrong page table level (pgtable-\u003Emode). It does compare the value with level encoded in page table and returns NULL. This will result is iommu_unmap ops to fail and upper layer may retry/log WARN_ON.  CPU 0                                         CPU 1 ------                                       ------ map pages                                    unmap pages alloc_pte() -\u003E increase_address_space()      iommu_v1_unmap_pages() -\u003E fetch_pte()   pgtable-\u003Eroot = pte (new root value)                                              READ pgtable-\u003E[mode/root] \t\t\t\t\t       Reads new root, old mode   Updates mode (pgtable-\u003Emode \u002B= 1)  Since Page table level updates are infrequent and already synchronized with a spinlock, implement seqcount to enable lock-free read operations on the read path.",
  "published": "2025-10-09T13:15:32Z",
  "severity": "Moderate",
  "cvss": 5.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00118,
  "epssPercentile": 0.01711,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39961",
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