CVE-2026-93283: i3c: master: Fix device_register() error path

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-24 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix device_register() error path When device_register() fails in i3c_master_register_new_i3c_devs(), put_device() is called to drop the reference taken by device_register(). That drops the last reference, so the device's release callback i3c_device_release() runs and frees the i3c_device. Two problems follow from that: i3c_device_release() does WARN_ON(i3cdev->desc), so it warns because desc->dev->desc still points back at the descriptor. Clear it before calling put_device(). After put_device() frees the i3c_device, desc->dev is left pointing at freed memory, so clear desc->dev as well. That prevents, for example, i3c_master_unregister_i3c_devs() seeing desc->dev as non-NULL and dereferencing it.

Affected products

Linux kernel: from 5.10.201 before 5.10.270; from 5.15.139 before 5.15.221; from 6.1.63 before 6.1.188; from 6.6.2 before 6.6.157; from 5.4.261 before 5.5; from 6.5.12 before 6.6 — fixed in 5.10.270, 5.15.221, 5.5, 6.1.188, 6.6, 6.6.157

How to fix

Upgrade to a fixed version: Linux kernel 5.10.270, 5.15.221, 5.5, 6.1.188. Check the vendor advisory for mitigations.

References

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