CVE-2026-92505

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

iommu/amd: Fix undefined behavior in devid_write debugfs function

When for_each_pci_segment() loop completes without finding a matching

segment, the pci_seg pointer is not NULL but points to an invalid memory

location (the list head). Accessing pci_seg->id after the loop causes

undefined behavior.

Fix this by handling the successful case inside the loop and returning

-EINVAL after the loop if no matching segment is found.