CVE-2026-74491 of/address: Fix NULL bus dereference in of_pci_range_parser_one()
A NULL pointer dereference in the Linux kernel's PCI range parser can cause a system crash, requiring a kernel patch to fix.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74491?
CVE-2026-74491 is a vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
of/address: Fix NULL bus dereference in of_pci_range_parser_one()
The bus matching rework made of_match_bus() return NULL for nodes with ranges/dma-ranges but no local #address-cells. parser_init() stored that NULL bus, and the range iterator later dereferenced it.
Reject such nodes in parser_init(), leaving an explicit empty iterator for callers that ignore the init return, and make of_dma_get_max_cpu_address() honour the init failure so a rejected node cannot clamp the DMA limit.
Which versions are affected by CVE-2026-74491?
How do I fix CVE-2026-74491?
Apply the vendor's patch.
Is CVE-2026-74491 being exploited?
There is no known exploitation of CVE-2026-74491 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74491, DEBIAN-CVE-2026-74491, GHSA-wjhg-hxg5-8vjp, UBUNTU-CVE-2026-74491.