CVE-2026-43313
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()
In acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE device and then reassigned an ISA device:
If the first lookup succeeds but the second fails, dev becomes NULL. This leads to a potential null-pointer dereference when dev_dbg() is called:
To prevent this, use two temporary pointers and retrieve each device independently, avoiding overwriting dev with a possible NULL value.
[ rjw: Subject adjustment, added an empty code line ]
Detalles técnicos trazas, registros y código del informe original
dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...);
dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...);
if (errata.piix4.bmisx)
dev_dbg(&dev->dev, ...);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: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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).
Tecnologías afectadas (1)
CWE
- CWE-476
Referencias
- https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf
- https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5
- https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5
- https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05
- https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254
- https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033
- https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()\n\nIn acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE\ndevice and then reassigned an ISA device:\n\n dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...);\n dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...);\n\nIf the first lookup succeeds but the second fails, dev becomes NULL. This\nleads to a potential null-pointer dereference when dev_dbg() is called:\n\n if (errata.piix4.bmisx)\n dev_dbg(&dev->dev, ...);\n\nTo prevent this, use two temporary pointers and retrieve each device\nindependently, avoiding overwriting dev with a possible NULL value.\n\n[ rjw: Subject adjustment, added an empty code line ]"
}
],
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