CVE-2026-92505

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2e98940f123d9c69d4759078aea9a536244c98d3 < 8aabe0fba01486b5d893e708b05a8fa7f1b7efbbaffected
LinuxLinux2e98940f123d9c69d4759078aea9a536244c98d3 < 99d42aef089a07cfb1d404a7227ac9dc7628b497affected
LinuxLinux2e98940f123d9c69d4759078aea9a536244c98d3 < 843e149989665f8309ad2efe6048dc76591e1f94affected
LinuxLinux6.17affected
LinuxLinux0 < 6.17unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References