CVE-2025-71118

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

ACPICA: Avoid walking the Namespace if start_node is NULL

Although commit 0c9992315e73 ("ACPICA: Avoid walking the ACPI Namespace if it is not there") fixed the situation when both startnode and acpigblrootnode are NULL, the Linux kernel mainline now still crashed on Honor Magicbook 14 Pro [1].

That happens due to the access to the member of parentnode in acpinsgetnextnode(). The NULL pointer dereference will always happen, no matter whether or not the startnode is equal to ACPIROOTOBJECT, so move the check of start_node being NULL out of the if block.

Unfortunately, all the attempts to contact Honor have failed, they refused to provide any technical support for Linux.

The bad DSDT table's dump could be found on GitHub [2].

DMI: HONOR FMB-P/FMB-P-PCB, BIOS 1.13 05/08/2025

[ rjw: Subject adjustment, changelog edits ]