CVE-2026-72454

Technical Description

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

i3c: mipi-i3c-hci: Fix race in i3c_hci_addr_to_dev()

i3c_hci_addr_to_dev() walks bus->devs.i3c, which is protected by

bus.lock (rwsem). However, it is invoked from the MIPI I3C HCI IRQ

handler, which cannot take bus.lock. This allows concurrent device

addition/removal in the I3C core to modify the list while it is being

traversed, potentially leading to use-after-free or crashes.

Remove the dependency on the bus device list and introduce a dedicated

lookup table. Add an ibi_devs[] array indexed by DAT entry, maintained

under hci->lock. Update the array when IBIs are enabled or disabled,

so that it always reflects the set of devices allowed to generate IBIs.

Also update when IBIs are freed, to cover the corner case when an IBI is

freed without first being disabled (e.g. oldedev in

i3c_master_add_i3c_dev_locked()).

Move i3c_hci_addr_to_dev() into core.c, reimplement it using the new

array, and add a lockdep asser

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References