CVE-2026-43313

Description

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: dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...); dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...); 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: if (errata.piix4.bmisx) dev_dbg(&dev->dev, ...); 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 ]

References

• 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