{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98254",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98254"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "swiotlb: use the adjusted address for the highmem page lookup",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nswiotlb: use the adjusted address for the highmem page lookup\n\nswiotlb_bounce() reads the page frame number from the slot's recorded\norig_addr, then advances orig_addr by tlb_offset to reach the address\nthe caller asked about. The highmem branch mixes the two: the offset\nwithin the page comes from the adjusted address, the page from the value\nbefore it.\n\nOnce the adjustment crosses a page boundary the pair no longer describes\none location, and the whole copy lands one page below the intended one\nfor a positive tlb_offset, one above for a negative one. DMA_FROM_DEVICE\nwrites the device data over the wrong page and leaves the intended one\nstale, DMA_TO_DEVICE feeds the device from a page the mapping may not\ncover. Partial syncs through dma_sync_single_range_for_*() are what make\ntlb_offset non-zero.\n\nThe branch test is picked the same way, so a slot recorded in lowmem can\nbe adjusted into highmem and the lowmem path then hands a highmem\naddress to phys_to_virt().\n\nTake both from orig_addr once it is final and keep pfn in the branch\nthat uses it. PhysHighMem() asks the question straight from the address,\nas dma-debug already does.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98254"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e53b4d6afbde626255805d438cabb1cac482445"
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      "url": "https://git.kernel.org/stable/c/aa4709813b29db89f2307f968db5d24925dcdeb1"
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    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The defect is in swiotlb_bounce(), reached only via __swiotlb_sync_single_for_cpu/_for_device from a driver's dma_sync_single_range_for_*() on a bounced buffer. No protocol message carries malformed input, and a local user can only cause it by doing I/O on a highmem buffer through such a driver.\nAC:L - Not used; the AC line below is the real value.\nPR:L - The attacker needs an ordinary local account to issue I/O whose buffers (user or page-cache pages, which can be highmem) go through an affected device's streaming DMA mapping. No capability check on the swiotlb sync path stands in the way.\nUI:N - Once the attacker's own I/O drives the partial-sync pattern, no victim action is needed. The bounce runs inside the driver's sync call.\nS:U - The bad copy is done by the kernel's own swiotlb code into kernel-managed physical memory. No IOMMU, VM or other boundary is crossed beyond the kernel's own authority.\nC:H - On DMA_TO_DEVICE, memcpy_from_page() uses pfn_to_page(PFN_DOWN(old orig_addr)) and feeds the device a whole neighbouring physical page the mapping does not cover. This can expose unrelated kernel or user data to the device.\nI:H - On DMA_FROM_DEVICE, memcpy_to_page() writes device data over the page next to the intended one, corrupting arbitrary neighbouring memory. Separately, a lowmem slot shifted into highmem sends a highmem address to phys_to_virt() and memcpy() through a bogus pointer.\nA:H - Overwriting an unrelated physical page, or calling memcpy() on a bogus phys_to_virt() pointer for a highmem address, can corrupt kernel state or fault and oops the kernel."
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}