CVE-2025-23147 Information

Description

In the Linux kernel the following vulnerability has been resolved:

i3c: Add NULL pointer check in i3c_master_queue_ibi()

The I3C master driver may receive an IBI from a target device that has not been probed yet. In such cases the master calls i3c_master_queue_ibi() to queue an IBI work task leading to �nable to handle kernel read from unreadable memory\ and resulting in a kernel panic.

Typical IBI handling flow:

1. The I3C master scans target devices and probes their respective drivers.
2. The target device driver calls i3c_device_request_ibi() to enable IBI and assigns dev->ibi = ibi.
3. The I3C master receives an IBI from the target device and calls i3c_master_queue_ibi() to queue the target device driver’s IBI handler task.

However since target device events are asynchronous to the I3C probe sequence step 3 may occur before step 2 causing dev->ibi to be NULL leading to a kernel panic.

Add a NULL pointer check in i3c_master_queue_ibi() to prevent accessing an uninitialized dev->ibi ensuring stability.

Reference

https://git.kernel.org/stable/c/6871a676aa534e8f218279672e0445c725f81026 https://git.kernel.org/stable/c/bd496a44f041da9ef3afe14d1d6193d460424e91 https://git.kernel.org/stable/c/d83b0c03ef8fbea2f03029a1cc1f5041f0e1d47f https://git.kernel.org/stable/c/e6bba328578feb58c614c11868c259b40484c5fa https://git.kernel.org/stable/c/fe4a4fc179b7898055555a11685915473588392e https://git.kernel.org/stable/c/ff9d61db59bb27d16d3f872bff2620d50856b80c