FKIE_CVE-2025-38256

Vulnerability from fkie_nvd - Published: 2025-07-09 11:15 - Updated: 2025-11-19 20:58
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: fix folio unpinning syzbot complains about an unmapping failure: [ 108.070381][ T14] kernel BUG at mm/gup.c:71! [ 108.070502][ T14] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 108.123672][ T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025 [ 108.127458][ T14] Workqueue: iou_exit io_ring_exit_work [ 108.174205][ T14] Call trace: [ 108.175649][ T14] sanity_check_pinned_pages+0x7cc/0x7d0 (P) [ 108.178138][ T14] unpin_user_page+0x80/0x10c [ 108.180189][ T14] io_release_ubuf+0x84/0xf8 [ 108.182196][ T14] io_free_rsrc_node+0x250/0x57c [ 108.184345][ T14] io_rsrc_data_free+0x148/0x298 [ 108.186493][ T14] io_sqe_buffers_unregister+0x84/0xa0 [ 108.188991][ T14] io_ring_ctx_free+0x48/0x480 [ 108.191057][ T14] io_ring_exit_work+0x764/0x7d8 [ 108.193207][ T14] process_one_work+0x7e8/0x155c [ 108.195431][ T14] worker_thread+0x958/0xed8 [ 108.197561][ T14] kthread+0x5fc/0x75c [ 108.199362][ T14] ret_from_fork+0x10/0x20 We can pin a tail page of a folio, but then io_uring will try to unpin the head page of the folio. While it should be fine in terms of keeping the page actually alive, mm folks say it's wrong and triggers a debug warning. Use unpin_user_folio() instead of unpin_user_page*. [axboe: adapt to current tree, massage commit message]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11e7b7369e655e6131387b174218d7fa9557b3daPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
To clipboard 

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              "matchCriteriaId": "64471BC5-89E0-43B3-8318-2D7EFF377CBD",
              "versionEndExcluding": "6.12.36",
              "versionStartIncluding": "6.12",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring/rsrc: se corrige la desanclaje de folio. syzbot se queja de un error de desasignaci\u00f3n: [ 108.070381][ T14] \u00a1ERROR del kernel en mm/gup.c:71! [ 108.070502][ T14] Error interno: Ups - ERROR: 00000000f2000800 [#1] SMP [ 108.123672][ T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025 [ 108.127458][ T14] Workqueue: iou_exit io_ring_exit_work [ 108.174205][ T14] Call trace: [ 108.175649][ T14] sanity_check_pinned_pages+0x7cc/0x7d0 (P) [ 108.178138][ T14] unpin_user_page+0x80/0x10c [ 108.180189][ T14] io_release_ubuf+0x84/0xf8 [ 108.182196][ T14] io_free_rsrc_node+0x250/0x57c [ 108.184345][ T14] io_rsrc_data_free+0x148/0x298 [ 108.186493][ T14] io_sqe_buffers_unregister+0x84/0xa0 [ 108.188991][ T14] io_ring_ctx_free+0x48/0x480 [ 108.191057][ T14] io_ring_exit_work+0x764/0x7d8 [ 108.193207][ T14] process_one_work+0x7e8/0x155c [ 108.195431][ T14] worker_thread+0x958/0xed8 [ 108.197561][ T14] kthread+0x5fc/0x75c [ 108.199362][ T14] ret_from_fork+0x10/0x20  Podemos anclar la p\u00e1gina final de un folio, pero entonces io_uring intentar\u00e1 desanclar la p\u00e1gina principal. Si bien esto deber\u00eda funcionar correctamente para mantener la p\u00e1gina activa, los usuarios de mm indican que es incorrecto y genera una advertencia de depuraci\u00f3n. Use unpin_user_folio() en lugar de unpin_user_page*. [axboe: adaptar al \u00e1rbol actual, modificar el mensaje de confirmaci\u00f3n]"
    }
  ],
  "id": "CVE-2025-38256",
  "lastModified": "2025-11-19T20:58:08.567",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-07-09T11:15:27.880",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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