CVE-2025-21883
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
ice: Fix deinitializing VF in error path
If ice_ena_vfs() fails after calling ice_create_vf_entries(), it frees all VFs without removing them from snapshot PF-VF mailbox list, leading to list corruption.
VFs are added to this list in ice_mbx_init_vf_info(), but only removed in ice_free_vfs(). Move the removing to ice_free_vf_entries(), which is also being called in other places where VFs are being removed (including ice_free_vfs() itself).
Detalles técnicos trazas, registros y código del informe original
Reproducer: devlink dev eswitch set $PF1_PCI mode switchdev ip l s $PF1 up ip l s $PF1 promisc on sleep 1 echo 1 > /sys/class/net/$PF1/device/sriov_numvfs sleep 1 echo 1 > /sys/class/net/$PF1/device/sriov_numvfs Trace (minimized): list_add corruption. next->prev should be prev (ffff8882e241c6f0), but was 0000000000000000. (next=ffff888455da1330). kernel BUG at lib/list_debug.c:29! RIP: 0010:__list_add_valid_or_report+0xa6/0x100 ice_mbx_init_vf_info+0xa7/0x180 [ice] ice_initialize_vf_entry+0x1fa/0x250 [ice] ice_sriov_configure+0x8d7/0x1520 [ice] ? __percpu_ref_switch_mode+0x1b1/0x5d0 ? __pfx_ice_sriov_configure+0x10/0x10 [ice] Sometimes a KASAN report can be seen instead with a similar stack trace: BUG: KASAN: use-after-free in __list_add_valid_or_report+0xf1/0x100
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 6/10/2026
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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 %
Vulnerabilidad local (AV:L/PR:L) de corrupción de memoria (CWE-416, use-after-free) en controlador de red Linux que permite escalada de privilegios y ejecución de código al manipular la inicialización de funciones virtuales (VFs) del kernel.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-416
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: Fix deinitializing VF in error path\n\nIf ice_ena_vfs() fails after calling ice_create_vf_entries(), it frees\nall VFs without removing them from snapshot PF-VF mailbox list, leading\nto list corruption.\n\nReproducer:\n devlink dev eswitch set $PF1_PCI mode switchdev\n ip l s $PF1 up\n ip l s $PF1 promisc on\n sleep 1\n echo 1 > /sys/class/net/$PF1/device/sriov_numvfs\n sleep 1\n echo 1 > /sys/class/net/$PF1/device/sriov_numvfs\n\nTrace (minimized):\n list_add corruption. next->prev should be prev (ffff8882e241c6f0), but was 0000000000000000. (next=ffff888455da1330).\n kernel BUG at lib/list_debug.c:29!\n RIP: 0010:__list_add_valid_or_report+0xa6/0x100\n ice_mbx_init_vf_info+0xa7/0x180 [ice]\n ice_initialize_vf_entry+0x1fa/0x250 [ice]\n ice_sriov_configure+0x8d7/0x1520 [ice]\n ? __percpu_ref_switch_mode+0x1b1/0x5d0\n ? __pfx_ice_sriov_configure+0x10/0x10 [ice]\n\nSometimes a KASAN report can be seen instead with a similar stack trace:\n BUG: KASAN: use-after-free in __list_add_valid_or_report+0xf1/0x100\n\nVFs are added to this list in ice_mbx_init_vf_info(), but only removed\nin ice_free_vfs(). Move the removing to ice_free_vf_entries(), which is\nalso being called in other places where VFs are being removed (including\nice_free_vfs() itself)."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ice: Se corrige la desinicialización de VF en la ruta de error. Si ice_ena_vfs() falla tras llamar a ice_create_vf_entries(), libera todas las VF sin eliminarlas de la lista de buzones PF-VF de la instantánea, lo que provoca la corrupción de la lista. Reproductor: devlink dev eswitch set $PF1_PCI mode switchdev ip ls $PF1 up ip ls $PF1 promisc on sleep 1 echo 1 > /sys/class/net/$PF1/device/sriov_numvfs sleep 1 echo 1 > /sys/class/net/$PF1/device/sriov_numvfs Rastreo (minimizado): corrupción de list_add. siguiente->anterior debería ser anterior (ffff8882e241c6f0), pero era 0000000000000000. (siguiente=ffff888455da1330). ¡ERROR del núcleo en lib/list_debug.c:29! RIP: 0010:__list_add_valid_or_report+0xa6/0x100 ice_mbx_init_vf_info+0xa7/0x180 [ice] ice_initialize_vf_entry+0x1fa/0x250 [ice] ice_sriov_configure+0x8d7/0x1520 [ice] ? __percpu_ref_switch_mode+0x1b1/0x5d0 ? __pfx_ice_sriov_configure+0x10/0x10 [ice] A veces, un informe de KASAN se puede ver con un seguimiento de pila similar: ERROR: KASAN: use-after-free en __list_add_valid_or_report+0xf1/0x100. Los VF se añaden a esta lista en ice_mbx_init_vf_info(), pero solo se eliminan en ice_free_vfs(). Traslada la eliminación a ice_free_vf_entries(), que también se invoca en otros lugares donde se eliminan VF (incluido el propio ice_free_vfs())."
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"lastModified": "2026-06-17T08:44:31.533",
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