{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38256",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38256"
  ],
  "published": "2025-07-09T10:43:51Z",
  "summary": "io_uring/rsrc: fix folio unpinning",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: fix folio unpinning\n\nsyzbot complains about an unmapping failure:\n\n[  108.070381][   T14] kernel BUG at mm/gup.c:71!\n[  108.070502][   T14] Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP\n[  108.123672][   T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025\n[  108.127458][   T14] Workqueue: iou_exit io_ring_exit_work\n[  108.174205][   T14] Call trace:\n[  108.175649][   T14]  sanity_check_pinned_pages+0x7cc/0x7d0 (P)\n[  108.178138][   T14]  unpin_user_page+0x80/0x10c\n[  108.180189][   T14]  io_release_ubuf+0x84/0xf8\n[  108.182196][   T14]  io_free_rsrc_node+0x250/0x57c\n[  108.184345][   T14]  io_rsrc_data_free+0x148/0x298\n[  108.186493][   T14]  io_sqe_buffers_unregister+0x84/0xa0\n[  108.188991][   T14]  io_ring_ctx_free+0x48/0x480\n[  108.191057][   T14]  io_ring_exit_work+0x764/0x7d8\n[  108.193207][   T14]  process_one_work+0x7e8/0x155c\n[  108.195431][   T14]  worker_thread+0x958/0xed8\n[  108.197561][   T14]  kthread+0x5fc/0x75c\n[  108.199362][   T14]  ret_from_fork+0x10/0x20\n\nWe can pin a tail page of a folio, but then io_uring will try to unpin\nthe head page of the folio. While it should be fine in terms of keeping\nthe page actually alive, mm folks say it's wrong and triggers a debug\nwarning. Use unpin_user_folio() instead of unpin_user_page*.\n\n[axboe: adapt to current tree, massage commit message]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.12.25-1+rpt1",
        "1:6.12.34-1+rpt1~bookworm"
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          {
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.36"
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        "name": "linux"
      },
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38256"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/11e7b7369e655e6131387b174218d7fa9557b3da"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}