CVE-2025-38256
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
io_uring/rsrc: fix folio unpinning
syzbot complains about an unmapping failure:
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]
Detalles técnicos trazas, registros y código del informe original
[ 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
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.15%
- Percentil entre todas las CVEs puntuadas: 4
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
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"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'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]"
},
{
"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 desasignación: [ 108.070381][ T14] ¡ERROR 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 página final de un folio, pero entonces io_uring intentará desanclar la página principal. Si bien esto debería funcionar correctamente para mantener la página activa, los usuarios de mm indican que es incorrecto y genera una advertencia de depuración. Use unpin_user_folio() en lugar de unpin_user_page*. [axboe: adaptar al árbol actual, modificar el mensaje de confirmación]"
}
],
"lastModified": "2026-06-17T09:16:29.603",
"configurations": [
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