In the Linux kernel, the following vulnerability has been resolved:
ACPI: processor: Fix NULL-pointer dereference in acpiprocessorerrata_piix4()
In acpiprocessorerrata_piix4(), the pointer dev is first assigned an IDE device and then reassigned an ISA device:
dev = pcigetsubsys(..., PCIDEVICEIDINTEL82371AB, ...); dev = pcigetsubsys(..., PCIDEVICEIDINTEL82371AB_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 ]
{
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43313.json"
}