CVE-2023-54095

Estado: AplazadaAlta (7)—

In the Linux kernel, the following vulnerability has been resolved:

powerpc/iommu: Fix notifiers being shared by PCI and VIO buses

fail_iommu_setup() registers the fail_iommu_bus_notifier struct to both PCI and VIO buses. struct notifier_block is a linked list node, so this causes any notifiers later registered to either bus type to also be registered to the other since they share the same node.

This causes issues in (at least) the vgaarb code, which registers a notifier for PCI buses. pci_notify() ends up being called on a vio device, converted with to_pci_dev() even though it's not a PCI device, and finally makes a bad access in vga_arbiter_add_pci_device() as discovered with KASAN:

Leer descripción completaMostrar menos

Fix this by creating separate notifier_block structs for each bus type.

[mpe: Add #ifdef to fix CONFIG_IBMVIO=n build]

Detalles técnicos trazas, registros y código del informe original

 BUG: KASAN: slab-out-of-bounds in vga_arbiter_add_pci_device+0x60/0xe00
 Read of size 4 at addr c000000264c26fdc by task swapper/0/1

 Call Trace:
   dump_stack_lvl+0x1bc/0x2b8 (unreliable)
   print_report+0x3f4/0xc60
   kasan_report+0x244/0x698
   __asan_load4+0xe8/0x250
   vga_arbiter_add_pci_device+0x60/0xe00
   pci_notify+0x88/0x444
   notifier_call_chain+0x104/0x320
   blocking_notifier_call_chain+0xa0/0x140
   device_add+0xac8/0x1d30
   device_register+0x58/0x80
   vio_register_device_node+0x9ac/0xce0
   vio_bus_scan_register_devices+0xc4/0x13c
   __machine_initcall_pseries_vio_device_init+0x94/0xf0
   do_one_initcall+0x12c/0xaa8
   kernel_init_freeable+0xa48/0xba8
   kernel_init+0x64/0x400
   ret_from_kernel_thread+0x5c/0x64

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 5
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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1005 Data from Local Systemcollection60 %

Vulnerabilidad local (AV:L) con privilegios limitados (PR:L) sin interacción: escalada de privilegios. KASAN detecta acceso fuera de límites (confidencialidad e integridad altas) en memoria 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

Threat Intelligence Program Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Data Loss Prevention

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2023-54095",
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/iommu: Fix notifiers being shared by PCI and VIO buses\n\nfail_iommu_setup() registers the fail_iommu_bus_notifier struct to both\nPCI and VIO buses.  struct notifier_block is a linked list node, so this\ncauses any notifiers later registered to either bus type to also be\nregistered to the other since they share the same node.\n\nThis causes issues in (at least) the vgaarb code, which registers a\nnotifier for PCI buses.  pci_notify() ends up being called on a vio\ndevice, converted with to_pci_dev() even though it's not a PCI device,\nand finally makes a bad access in vga_arbiter_add_pci_device() as\ndiscovered with KASAN:\n\n BUG: KASAN: slab-out-of-bounds in vga_arbiter_add_pci_device+0x60/0xe00\n Read of size 4 at addr c000000264c26fdc by task swapper/0/1\n\n Call Trace:\n   dump_stack_lvl+0x1bc/0x2b8 (unreliable)\n   print_report+0x3f4/0xc60\n   kasan_report+0x244/0x698\n   __asan_load4+0xe8/0x250\n   vga_arbiter_add_pci_device+0x60/0xe00\n   pci_notify+0x88/0x444\n   notifier_call_chain+0x104/0x320\n   blocking_notifier_call_chain+0xa0/0x140\n   device_add+0xac8/0x1d30\n   device_register+0x58/0x80\n   vio_register_device_node+0x9ac/0xce0\n   vio_bus_scan_register_devices+0xc4/0x13c\n   __machine_initcall_pseries_vio_device_init+0x94/0xf0\n   do_one_initcall+0x12c/0xaa8\n   kernel_init_freeable+0xa48/0xba8\n   kernel_init+0x64/0x400\n   ret_from_kernel_thread+0x5c/0x64\n\nFix this by creating separate notifier_block structs for each bus type.\n\n[mpe: Add #ifdef to fix CONFIG_IBMVIO=n build]"
    }
  ],
  "lastModified": "2026-08-04T10:19:28.880",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}